Surveillance video shows Tsarnaev brothers visiting gun range

BOSTON (MyFoxBoston.com) - The FBI first identified him simply as White Hat, and on Tuesday,  an FBI agent identified a white polo baseball cap matching the one seen at the marathon finish line, as an item retrieved from Dzhokhar's UMass Dartmouth dorm room.

Earlier testimony in the day showed the Tsarnaev brothers entering and leaving a shooting range in New Hampshire.

On March 20, 2013, three and a half weeks before the Boston Marathon bombings, Dzhokhar and Tamerlan Tsarnaev were captured on video surveillance visiting the Manchester, N.H. gun range.

According to receipts shown to the jury, Dzhokhar Tsarnaev rented two Glock 9mm pistols and bought four boxes of 9mm ammunition, spending $170.70.

He signed his name.

According to check-in forms, both Dzhokhar and Tamerlan Tsarnaev self-reported themselves as having intermediate skills in using a handgun, and neither admitted to any mental health issues or being under the influence of drugs.

After spending about an hour at the gun range, the two Tsarnaevs left.

In other testimony, a Mass State Police ballistics expert positively identified the Ruger 9mm pistol found on Laurel Street, the scene of the Watertown shootout, as the weapon used to kill MIT Police officer Sean Collier.

Last week, witness Stephen Silva a friend of Dzhokhar's, testified he lent his 9mm Ruger to Dzhokhar Tsarnaev, and when he asked for its return, Dzhokhar put him off.

In court, that Ruger was matched to the Sean Collier murder, and to 56 shell casings or bullet fragments recovered from Laurel Street.

Other evidence revealed shots fired into homes, some of them, penetrating walls and hitting items inside.

A fingerprint expert identified Dzhokhar Tsarnaev's prints on the outside of a box of ammo found on Laurel Street and on the trigger of an air gun used in the Watertown shootout.

However, it was Tamerlan's prints on live rounds found inside the ammo box and on the empty magazine found attached to the 9mm Ruger lying in the middle of  Laurel Street.

In a dramatic moment, the government recalled its DNA expert who examined blood found on Dzhokhar's Honda car keys.

That blood, she testified, matched MIT Police Officer Sean Collier's DNA.

Cox Media Group