KYW via CNN(CNN) - A 10-year-old boy walking home from school in Philadelphia was critically injured Wednesday when he was shot in the back of the head by a stray bullet, according to police. Philadelphia police said a man involved in the shooting has been arrested, but the gunman remains on the loose, CNN affiliate KYW reported. "He tries to cover the kid and protect the kid, but the kid takes a shot," Philadelphia Police Capt. The shooting comes just weeks after a 2-year-old girl was killed and an 11-month old critically wounded in two separate shootings. So far this year, there have been more than 300 homicide victims in Philadelphia, according to statistics by Philadelphia police.

KYW via CNN(CNN) - A 22-month-old girl has died after she was found unresponsive in a van outside a commuter rail station in Lindenwold, New Jersey, prosecutors said. A 911 call at about 3:38 p.m. Friday reported a child inside a van at the PATCO High Speed Line, according to a press release from the Camden County Prosecutor's Office. Police arrived and found the girl unresponsive in her car seat and the passenger window broken, authorities said. The investigation is ongoing and no charges have been filed at this time, the prosecutor's office said. Another 26% of children die after entering a vehicle on their own, and about 19% are left there intentionally.

(CNN) - Officers are attempting to communicate with a gunman more than five hours after he opened fire Wednesday in North Philadelphia, wounding six officers, police officials said. Here's what we know:How it startedThe shooting began when authorities attempted to serve a warrant at about 4:30 p.m. Where it's happeningPolice and other law enforcement agencies responded to a report of an "active shooting" at a house, Sgt. Two police officers who were trapped inside the house when the shooting began were evacuated by SWAT officers, Gripp said in a tweet. "Our thoughts are with the members of @PhillyPolice injured today and everyone working to resolve the situation currently happening in North Philadelphia," the baseball team said in a tweet.