MILWAUKEE (CBS 58) -- An officer-involved shooting is under investigation near 15th and Grant in Milwaukee Thursday morning, March 12, according to a police source. 

The source tells CBS 58 a Milwaukee police officer was dragged by a vehicle. 

According to the Milwaukee Fire Department, three people were transported to the hospital from the scene just after 10 a.m. The extent of their injuries is unknown. 

Investigators have about three blocks blocked off, with several officers gathered around an area with red tape. 

This is a developing story. Stick with CBS 58 on-air and online for updates. 

Police shooting near 15th and Grant in Milwaukee CBS 58