Authorities say a Dixmont man is in critical condition after being shot by police following a nearly 20-hour standoff with dozens of officers.

Officials say what started as an armed confrontation with a neighbor ended in gunfire Friday morning off the North Road in Dixmont.

The neighbor called police saying he was concerned for his friend's mental health after 61-year old Micheal Grendall shot at him while pursuing him in a vehicle, with some of those shots striking the neighbor's car and house.

"Our officers arrived and were met by an armed subject and established a perimeter and over the proceeding 18 hours or so attempted to make contact with that subject," said Colonel, John Cote of Maine State Police.

61-year old Michael Grendell is facing felony charges after police say he shot at police during a standoff off North Road in Dixmont.

Police say the incident started Wednesday afternoon after Grendell shot at his friend and then went back into his home on Fox Lane.

After hours of negotiating, police say Grendell came out of the home with a baseball bat, then picked up a gun, firing several rounds at officials Friday morning, striking a robot and an armed vehicle.

We're told no officers or members of the public were injured.

But, authorities say they caused damage to the home with explosives during the time they were trying to convince Grendell to surrender.

"Our hand was forced in some ways by Grendell continuing to engage in shooting from his residence," said Cote. "At a certain point, we needed to protect our officers and the neighbors."

The District Attorney's office says State Police contacted them Thursday evening and later issued an arrest warrant on a complaint for criminal threatening and reckless conduct.

Assistant District Attorney Marianne Lynch says the confrontation started over a package that had been delivered.

"It was an extremely dangerous, serious situation that occurred," said Lynch. "Anytime that you have firearms being discharged or a number of gunshots that had been fired at his friend, between six and eight, and then he created this armed standoff last night with the Maine State Police."

"Command members considered many options when deciding to use an explosive device and the detonation of that device resulted in Grendell coming out of his residence," explained Cote.

Police say more charges are likely.

We're told the three officers involved in the shooting are on paid administrative leave while the investigation continues.

If Grendell gets released from the hospital, he's expected to make his first court appearance Monday.