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Aaron Alexis, 34, killed 12 people in DC shooting on September 16
No indication Alexis targeted specific individuals, FBI said on Wednesday
Chilling footage of the Navy Yard shooter as he stalked random victims through hallways with a sawed-off shotgun has been released by the FBI today.
There is no indication that Aaron Alexis targeted any specific individuals when he sprayed bullets inside a building, killing 12 people on September 16.
In the short clip, Alexis is first seen driving into an underground parking garage in his rental car, a blue Toyota Prius, through the Washington Navy Yard main gate in DC.
He then is caught on camera entering building 197 carrying a backpack. Alexis had legitimate access to the Washington Navy Yard as a result of his work as a contractor and he used a valid pass to enter.
Scroll down to watch surveillance footage of the Navy Yard shooter
Terror in the hallways: Aaron Alexis, a former Navy employee, stalks the halls of a Navy Yard building in Washington DC with a sawed-off shotgun on September 16
In the next heart-stopping segment, Alexis creeps through hallways and bounds down a stairwell carrying a Remington 870 shotgun.
As he jogs down one corridor, people can be seen moving at speed through a doorway at the opposite end.
Valerie Parlave, head of the FBI’s field office in Washington, said on Wednesday during a news conference that investigators are continuing to explore the background and motivations of 34-year-old Alexis.
The former Navy employee had a well-documented history of mental health issues.
Parlave says Alexis held a delusional belief that he was being controlled by extremely low frequency waves, or ELF waves.
Alexis had written 'my ELF weapon' on a shotgun he used in the rampage. He also had the words: 'Better off this way!' etched on the side.
Lying in wait: Alexis, a former Navy reservist with mental health problems, carries a sawed-off shotgun in the building where he killed victims at random
Chilling: A close-up of the left side of Aaron Alexis' Remington 870 shotgun with sawed-off barrel and stock. He had scratched 'my ELF weapon' on the side as he held a delusional belief he was being controlled by low-frequency or ELF waves
Disturbed: 'Not what yall say' is scratched on the shotgun used by Aaron Alexis at the Navy Yard shooting last week
The gunman, a former Navy reservist and IT consultant, was later shot dead by responding officers after he opened fire inside a Navy facility around 8.20am on September 16, killing 12 people.
He was killed in one of several running gun battles with police after he entered the Naval Sea Systems Command headquarters and started picking off victims in a cafeteria from a fourth-floor atrium, witnesses said.
Pandemonium ensued, with fire alarms sounding and security officers yelling at people to leave the building. Hundreds fled, some scrambling over walls to escape the gunfire.
A loudspeaker announcement ordered those who remained to shelter in place in their offices.
Aaron Alexis, 34, had a history of mental illness and had previously been arrested over shooting incidents, it emerged in the aftermath of the Navy Yard massacre
Aaron Alexis entering Building 197 with a backpack on September 16 using a legitimate security pass as a result of his work as a contractor
Alexis' backpack that was found hanging on the back of a bathroom stall door in the fourth-floor men's bathroom at building 197 at the DC Navy Yard
The motive for the mass shooting - the deadliest on a military installation in the U.S. since the tragedy at Fort Hood, Texas in 2009 - was a mystery, investigators said.
But a profile of Alexis, was coming into focus. He was described as a Buddhist who had also had flares of rage, complained about the Navy and being a victim of discrimination and had several run-ins with law enforcement, including two shootings.
Those killed were aged 46 to 73, he said. Investigations continued into the circumstances of their deaths.
Aaron Alexis' Remington 870 shotgun with sawed-off barrel and stock, seen in a handout photo from the FBI
Deranged: The shotgun had words etched on it including 'End to the torment'
Terror: People exit a building with their hands above their heads as police respond to the shooting at the Navy Yard in Washington, DC
They are, according to Washington's Metropolitan Police Department: Michael Arnold, 59; Sylvia Frasier, 53; Kathy Gaarde, 62; John Roger Johnson, 73;Frank Kohler, 50; Kenneth Bernard Proctor, 46; Arthur Daniels, 51 and Vishnu Pandit, 61.
Investigators had pursued a possible second gunman but later said there were no suspects beyond Alexis.
The incident has raised questions about security at the Washington Navy Yard, about a mile south of the U.S. Capitol and three miles from the White House.
Access: Alexis drives his rental car, a blue Toyota Prius, through the Washington Navy Yard main gate on September 16
FBI assistant field director Valerie Parlave (left) shares the findings of the Navy Yard shooting investigation today in DC