Maine authorities won't say whether mass shooter was on law enforcement's radar

Maine's Department of Public Safety commissioner declined Friday to say whether the suspect in the mass shooting in the state earlier this week was on law enforcement's radar – amid news reports the suspect's family members warned authorities about his "mental state."

"I'm not going to talk specifically about who knew what and when, agency Commissioner Mike Sauschuck said at a press conference in the city of Lewiston. "We're still actively involved in a very dynamic situation here."

Authorities are looking for Robert Card in connection with the fatal shooting of 18 people and injuring 13 others at a bowling alley and bar in Lewiston on Wednesday evening. 

Card's sister-in-law said the family reached out to police and the suspect's Army Reserve base as they “got increasingly concerned" in the last couple of months about his mental health.

“We just reached out to make sure everyone was on the same page, because he is someone who does gun training,” she said, according to NBC News. “We were concerned about his mental state. That’s all.”

Sauschuck also said law enforcement is putting divers and sonar equipment into the Androscoggin River, near the boat launch that was one of the last places Card, 40, was known to be and that the search would likely expand to the other side of the river, in an apparent attempt to pick up his trail.    

"We've got a lot of lines in the water," Sauschuck also said. "We've got nothing to hide."

He also said the collective of law enforcement agencies will continue with its aerial search.

"We're going to be all over the place," Sauschuck said.