AURORA, Colo. (AP) - The city of Aurora is planning a study of the response to the Colorado theater shootings amid questions about why emergency medical personnel didn't get into the theater until nearly 24 minutes after the attack.

The Denver Post reports ( ) the Aurora City Council gave initial approval to the $250,000 study Monday night.

Officials say the results could be made public in six months unless a judge's gag order on the criminal case prevents responders from speaking with researchers.

Recordings of radio transmissions indicate dispatchers sent the first two ambulances within 3½ minutes and sent others after that as officials struggled to grasp the extent of the tragedy.

Twelve people were killed in the July attacks. It's unclear whether police efforts to secure the theater kept paramedics from entering sooner.