Louisville police respond to active shooting, LMPD officers say 'multiple casualties'

 Louisville police, mayor urging public to stay out of downtown are

The Louisville Metropolitan Police Department says there are "multiple casualties" in the Kentucky city Monday as officers are responding to "reports of an active aggressor." 

"We are confirming reports of an active aggressor in the 300 block of East Main. Please stay out of the area," police said in tweet. "There are multiple casualties." 

Images taken in the area showed a police officer with his weapon drawn. The shooting happened at a building that houses an Old National Bank location, according to the Associated Press.

"Please pray for all of the families impacted and for the city of Louisville," Gov. Andy Beshear said in a tweet, adding that he is heading there now.

Police respond to an "active aggressor" situation in Louisville, Kentucky on Monday, April 10. (WDRB)

Agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) also were photographed at the scene. 

The FBI's Louisville office tweeted that its "special agents have responded to the scene of this morning's shooting in downtown Louisville and are assisting our law enforcement partners."

An ATF agent is seen Monday. April 10 in Louisville, Kentucky. (WDRB)

A witness inside the building where the shooting happened told WHAS11 that an unidentified man with a "long assault rifle" began opening fire on the first floor.

"He just started firing," the witness reportedly said. "I didn't see his face. We were in the conference room. Whoever was next to me got shot, their blood's on me."

Police are urging the public to stay away from an area of downtown Louisville, Kentucky as officers respond to an "active aggressor" situation. (WDRB)

Another witness said the shooter and law enforcement exchanged fire, according to WHAS11.

Louisville Mayor Craig Greenberg said there was an "active police situation downtown" and for the public to "please avoid the area around Slugger Field until further notice."