Authorities are investigating two targeted but unrelated home invasions that happened within a half-hour late Monday, Suffolk police said.

Police said the first happened at 11:30 p.m. when two men, armed with what appeared to be a handgun, kicked in the door of an occupied North Patchogue residence and fought with a woman and her adult son who were inside.

Police said that after entering the home on Pine Court a “physical altercation ensued between the suspects and the residents.”

The son suffered minor injuries but refused medical attention, police said, and the suspects fled with undisclosed proceeds.

“Police believe this is not a random incident,” Suffolk County police said in an emailed statement. They added they did not believe it to be connected to another home invasion that happened in Port Jefferson Monday night.

In the Port Jefferson incident three men entered a home on Sheep Pasture Road about 11:50 p.m. and assaulted the homeowner before stealing money and a pickup truck and fleeing, Assistant Police Commissioner Justin Meyers said in a statement Tuesday.

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The homeowner was treated at Stony Brook University Hospital for injuries that were not life-threatening, the statement said.

“Detectives have credible information that this location was targeted and not a random act,” the statement said. “Patrols will be stepped up in the area as part of the investigation.”