Police are asking people to shelter in place in response to an “active shooter” in Lewiston, Maine, authorities said Wednesday. Police said that they were investigating “multiple locations.”

“Please stay inside your home with the doors locked,” Maine State police wrote on social media.

Lewiston police said it responded to two locations, a restaurant called Schemengees, and Sparetime Recreation, a bowling alley. The two locations appear to be about a 10-minute drive from each other.

It was not immediately clear how many casualties there might be. A suspect was still at large, the Androscoggin County Sheriff’s Office said on Facebook. Police also shared images of the suspect and asked people to contact them “if you recognize this individual.”

The Central Maine Medical Center in Lewiston said in a statement that it was “reacting to a mass casualty, mass shooter event,” but did not have further details on the number of patients or severity of their injuries.

The city of Auburn, Maine, which borders Lewiston to the west, advised residents of both Auburn and Lewiston to shelter in place. Lewiston is located about 45 minutes north of Portland. 

Maine Gov. Janet Mills released a statement saying she was briefed on the situation. “I urge all people in the area to follow the direction of State and local enforcement,” Mills said. “I will continue to monitor the situation and remain in close contact with public safety officials.”

The office of Maine Sen. Angus King said in a statement that he was “deeply sad for the city of Lewiston and all those worried about their family, friends and neighbors.” 

This is a developing story and will be updated.