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Matt Rourke, Associated Press
Law enforcement officers salute the remains of Philadelphia Police Officer Robert Wilson III on Saturday, March 14, 2015, in Philadelphia. City officials said on March 5, 2015 Wilson was shot and killed after he and his partner exchanged gunfire with two suspects trying to rob a video game store.

PHILADELPHIA — Mourners packed a sports arena for the funeral of a Philadelphia police officer fatally shot while trying to stop a video game store robbery.

Thousands of officers in blue dress uniforms stood silently as Officer Robert Wilson III's family entered the Palestra at the University of Pennsylvania on Saturday. A large sketch at the arena's entrance of the 8-year department veteran was covered in mourners' signatures.

Wilson was killed March 5 at a GameStop store in north Philadelphia. He had stopped for a security check and to buy a game for his son.

Police say the 30-year-old father of two was getting the game to reward his son for good grades and for his 10th birthday, which was Monday.

Two brothers have been charged with murder in Wilson's death.