The Boston Police Departnmet’s Youth Violence Strike Force confiscated three guns, including a submachine gun, and arrested four men in three separate incidents Saturday, police said in a statement.

Just after 2:27 a.m., officers responded to a report that a man was threatening individuals with a gun and found Kenneth Madden, 18, of Belmont at 595 Dudley St. He was arrested after officers allegedly found a semiautomatic firearm in the car he was standing next to.