CBS radio affiliate WSB says reporters heard what may have been a concussion grenade before ambulance and fire vehicles went to and from Dykes' property about 4p.m. Eastern Time Monday

[link to www.cbsnews.com]

Before the news conference Monday, an ambulance that had been parked near the scene could be seen driving away. However, it was not clear if anyone was inside, and the vehicle did not have its sirens or emergency lights on.

Daryle Hendry, who lives about a quarter-mile from where Dykes was holed up, says he heard a boom followed by a gunshot this afternoon. It was not immediately known what may have caused the noise.

[link to www.wwltv.com]