During the searches, documents related to exchange of California almonds were seized by NIA and were being scrutinised, the NIA said.
The grenade was aimed at a paramilitary patrol party, but missed the target.
The IEDs, weighing 70 kg and 60 kg and kept in polythene bags on the roadside, were detected by BSF's 55 Battalion's road opening party at Palhalan, 30 km from Srinagar.
Mobile Internet services continued to remain snapped in the Valley.
Three militants and two civilians were killed in an encounter between a group of heavily armed terrorists and security forces in northern Kashmir's Baramulla district early on Tuesday morning.
Curfew was imposed on Friday morning in seven police station areas of Srinagar district as a precautionary measure, a police official said.
They detected two explosive devices at Sogam bus stand in Kupwara district and Sopore bus stand in Baramulla district, sources said.
Trade across the Line of Control has been hit once again after police and customs officers recovered narcotics hidden in orange crates late on Friday night.
Two senior Jammu and Kashmir ministers were among over 32 injured in a powerful hand grenade explosion at a Peoples Democratic Party rally in the border town of Uri in Barramulla district on Thursday afternoon.
They are being questioned about their involvement in the killing of former Home Minister Mushtaq Ahmad Lone last year and some suicide attacks on security forces.
The constable fired several rounds, killing the sub-inspector on the spot.
The Anantnag police, however, said they were not aware of the incident.
Mostly of the militants belonged to Pakistan-based Lashkar-e-Tayiba and Jaish-e-Mohammad.
The operation turned into an encounter after terrorists opened fire on security forces.
The phones were seized from the prisoners, who included those held on charges of militancy and stone-pelting, just three days after Union Home Minister Rajnath Singh said that Pakistan is using social media to fuel unrest in Kashmir.
'We are caught between the devil and the deep blue sea'
Six militants were killed on Friday in two encounters with the security forces in Baramulla and Kupwara districts of Jammu and Kashmir, a defence spokesman said.
The militants, hiding in Watlipora-Tangmarg area, put up a brief resistance before being shot down by a crack team.
Militants on Wednesday had caused four blasts in different parts of Baramulla and Anantnag districts, killing two civilians and wounding 48.
An 18-year-old youth was killed on Saturday after being hit by a tear gas shell fired by security forces to disperse a mob which indulged in stone-pelting in Zainakote area of the city.
The SPO was on duty at Bandipora when the militants attacked his 30-year-old wife Shaha and 8-year old daughter Misra.
Groups of youth took to the streets at Press Colony and Khanyar in support of Naik.
Three persons were also hurt when militants exploded an Improvised Explosive Device at Tehsil chowk of the district.
Security forces have been deployed in strength in sensitive and vulnerable areas to maintain law and order.
Singh said there is a large presence of terrorists across the Line of Control (LoC) but expressed confidence that the counter-infiltration grid will take care of the threat.
Jammu and Kashmir has been hit by three terror attacks in three hours. Unidentified gunmen shot at a civilian in Tral in south Kashmir's Pulwama district on Monday.
The terrorist, identified as LeT's Asif Maqbool Bhatt, was killed in a brief encounter in Sopore in the valley's Baramulla district, police said.
The Srinagar-Muzaffarbad bus service on Monday resumed after remaining suspended for two weeks following a deadlock over the arrest of a driver from Pakistan-occupied Kashmir on drug trafficking charges.