The arrest comes as the district is in a state of heightened security following the January 6 insurrection attempt at the US Capitol.
As investigators go deeper into the ideological background of Omar Mateen, the perpetrator of the worst mass shooting in modern US history when he killed 50 people at a gay nightclub in Orlando, it's the gunman's choice of weapon that has set the alarm bells ringing.
In one of the worst school shootings in American history, an 18-year-old gunman has killed 21 people, including 19 children, and two adults at an elementary school in Texas state, with an emotional President Joe Biden urging lawmakers to 'turn this pain into action' to control the powerful gun lobby.
Chaos broke out at the main airport of Houston when a man fired gunshots into the air with his assault rifle, before shooting himself to death.
He had posted numerous messages threatening to attack individuals and gatherings of people who he believed were opponents of his radical beliefs.
'Be assured this is just the beginning of the work we'll be doing'
The teenager, Nikolas Cruz, accused of using a semi-automatic rifle to kill 17 people at a Florida high school did not appear to be a peaceful man on social media. He made quite clear his desire to perpetrate the exact type of violence of which he now stands accused. Charged with 17 counts of premeditated murder, here's what we know about him so far.
"The president has been quite frustrated, and in some cases even angry, about congressional inaction," he said.
The shooting began at a home in the rural community of Rancho Tehama, about 195 kilometre from Sacramento, on Tuesday morning.
Henry Bello, the shooter, was lying on a floor of the hospital dead of an apparent self-inflicted gunshot wound. He had apparently tried to set himself on fire as during the incident, the hospital's fire alarm got activated.
Mark Hughes was identified on national TV as a possible suspect after he was seen carrying assault rifle.
Hundreds of thousands of people have flooded the American capital on Saturday for the "March for Our Lives" to support tougher gun controls and protest Congress's refusal to consider them. The event is being led by the student survivors of the Marjory Stoneman Douglas High School shooting on February 14 when 17 were slaughtered by a teenage gunman carrying a legally-purchased AR-15.
Kalashnikov USA announced on Tuesday that it is now selling AK-47 assault rifles and shotguns that have been manufactured at a US factory.
A terrified 30-year-old man texted his mother while trapped inside the Orlando, Florida nightclub where at least 50 people were killed early Sunday.
Law enforcement officials in San Bernardino said they could not rule out terrorism as a possible motive for the mass killings at a centre for people with disabilities that left 14 people dead and 17 others injured.
Will James Holmes face death is the next question jurors will be asked after finding him guilty.
The massacre, among the deadliest school shootings in US history, has once again sparked a debate about lax US gun laws and lawmakers' continued inaction on gun control.
The mass shooting, which is said to be 18th school shooting of the year, seems to have rekindled a debate on the controversial gun control legislation in the US.
A shootout at the Grand Theater in Lafayette in the American state of Louisiana has claimed the lives of three people, including the gunman, and injured seven.
Lori Alhadeff, who lost her 14-year-old daughter, asked how a gunman is allowed to enter schools and questioned what security was in place to stop it.
Superheroes have been embedded in our daily lives through comics and movies.
Srinivas Bhogle and Purnendu Maji reveal Rediff's Most Valuable Players in IPL 10.
A $28,500 deposit was made to the account of slain gunman Syed Farook, a media report has said.
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