Curfew was imposed on Thursday after protesters stormed police stations demanding the release of five youths who had earlier been arrested for carrying sophisticated weapons and wearing camouflage uniforms similar to army fatigues.
The use of drones to mount attacks was new to the ethnic clashes in Manipur that left over 200 people dead since May last year.
The militants fired indiscriminately from hilltop positions towards the low-lying valley areas of Koutruk and neighbouring Kadangband killing the woman and injuring four others, including her eight-year-old daughter and a police officer.
Protests erupted in Imphal, Manipur, on Monday, as a group led by the Coordinating Committee on Manipur Integrity (COCOMI) locked government offices in protest of the recent killing of three women and three children in Jiribam. The Manipur government also extended the suspension of internet services for two more days, till Wednesday, in seven districts of the state. The protests come amidst a fresh wave of unrest following the disappearance of six people from a displaced persons camp in Jiribam and the subsequent discovery of multiple bodies.
They staged sit-in demonstrations in various localities blocking roads, demanding the removal of Assam Rifles from violence-hit areas and accusing the paramilitary force of "brutality during recent agitations".
The incident took place as several dozens of armed men opened indiscriminate fire on Koutruk village in the periphery of Imphal Valley from the adjoining hills in Kangpokpi district, a police officer said.
Manipur Chief Minister N Biren Singh on Tuesday condemned the drone bomb attacks on civilians as acts of terrorism and vowed a firm response.
Two bodies, including that of a woman, with bullet wounds were recovered in Imphal East and West districts in Manipur, police said on Thursday.
The injured were later safely evacuated to Imphal for treatment. Condition of the one of them is serious, officials said.
Manipur Chief Minister N Biren Singh on Thursday said the state government is working towards peace talks and has held several meetings in Assam's Silchar.
Three persons were killed and four others injured in a gunfight between two armed groups in Manipur's Imphal West district on Monday morning, police said.
The militants armed with sophisticated weapons surrounded the villagers of the Khamelok area bordering Imphal East district and Kangpoki district and launched the attack at around 1 am, the police said.
The villagers were venting their anger after militants burnt down at least 100 abandoned houses including the residence of Sugnu Congress MLA K Ranjit at Serou in Kakching district on Saturday midnight.
A special court in Manipur on Friday granted bail to the five village defence volunteers who were arrested by the police for possessing weapons amid an agitation for their release, officials said.
Curfew was imposed in the entire Imphal valley on Thursday following violent protests for the release of five men, including a trained cadre of a banned terror outfit, who were arrested earlier this week on the charges of extortion.
A large number of women from Malom in Imphal West district blocked the road to the airport in protest against the killing of the policemen in Moreh.
Attempts to resume Manipur State Transport (MST) services on Saturday suffered a setback after buses heading from capital Imphal to the hill districts could not go beyond Imphal valley.
The incident occurred at Kwakeithel Mayai Koibi under Lamphel police station a day after classes 1 to 8 began in the state after two months because of the violence.
Officials added that one INSAS light machine gun was recovered by the forces during initial search.
Meira Paibis, a collective of Meitei women, on Friday staged sit-in demonstrations across five districts of Imphal Valley in protest against the alleged gang rape of a 37-year-old woman in Churachandpur on May 3, when the ongoing ethnic violence started.
Eight firearms and 112 rounds of ammunition were recovered from different districts of violence-hit Manipur during search operations by security forces, police said.
The Manipur government relaxed the curfew in Imphal East and West districts for seven hours from 5 am on Friday to facilitate common people to purchase essential items, officials said.
A village volunteer was killed in a gunfight between two warring communities in Manipur's Kangpokpi district, officials said on Thursday.
The Manipur police said all personnel of the force from top to bottom are united and any attack on anyone and use of social media to target any officer or unit will be taken seriously and stringent action will be taken.
A CCTV captured video of head constable Satish Prasad, allegedly abusing the woman donning his combat uniform and carrying an INSAS rifle, was also shared widely over social media.
Security forces columns, which were immediately deployed in these "vacant" villages, responded cautiously to avoid any collateral damage.
Fifteen houses were set on fire in Manipur's Imphal West district where fresh violence broke out, officials said on Sunday.
In most parts of the landlocked northeastern state, items such as rice, potato, onion and egg besides LPG cylinders and petrol are selling at rates much above the ones fixed by the government.
The withdrawal of Assam Rifles comes at a time when several groups of women in valley districts launched a demonstration on Monday, demanding the removal of the paramilitary force from the ethnic strife-torn northeastern state.
An attempt was also made to torch another property of the consumer and food affairs minister and his residence at Khurai in the same district on Friday night but timely intervention prevented it.
Representatives of the Committee on Mass Protest against Assam Rifles organised sit-ins to protest against the paramilitary force's legal notice to Republican Party of India-Athawale national secretary Maheshwar Thounaojam for harming the "reputation of the organisation".
A mob tried to attack Chief Minister N Biren Singh's empty ancestral house on Thursday night, despite a security clampdown and curfew in the Imphal valley.
There was a brief lull between 3 am and 6 am, but the sounds of indiscriminate firing from Phayeng and Singda villages in the Kangchuk area along the two districts resumed after that.
At Thamnapokpi under Moirang constituency in Bishnupur district, armed men fired several rounds in the air near a polling booth prompting voters to flee, police said on Friday, adding additional security personnel were rushed to the spot to contain the situation.
The latest clashes began after the army and para-military forces commenced combing operations to de-arm communities in order to bring peace, officials said.
Security forces fired several rounds in the air to disperse the mob, officials said.
The situation in Manipur's Imphal valley was calm but tense on Friday morning after a night of violent clashes including an attempt to attack the empty ancestral residence of Chief Minister N Biren Singh.
Two abandoned houses were set on fire by unidentified people in Manipur's Imphal West district in the early hours of Wednesday, an official said.
The death toll from clashes a day before rose to five on Monday as three more people, who were undergoing treatment in hospitals, succumbed to their injuries, they said.
Security forces which tried to quell the mob were forced to use force and fired tear gas shells at the mob at New Checkon in Imphal, they added.