Baltimore police say a burglary suspect laid on the floor of a convenience store for about a half-hour with a gunshot wound to the head before officers noticed he was still alive.

Police spokesman Anthony Guglielmi says 51-year-old Michael Quarles was shot by an officer after he lunged at the officer with a long screwdriver early Saturday. The officer initially thought Quarles was wielding a knife.

Guglielmi says emergency medical technicians responded to the scene and pronounced Quarles dead, then left. About 30 minutes later, he says the officers noticed Quarles moving. The EMTs were recalled to the scene, and Quarles was taken to a trauma center. He remained in critical condition on Monday.

The city's fire department is investigating the EMTs, who have been temporarily reassigned.