A charter school teacher walking on the Metropolitan Branch Trail in Northeast Washington was beaten and robbed Thursday night by a large group of assailants, according to D.C. police.

The 50-year-old victim managed to return to his school and call for help, according to authorities. Police said he was taken to a hospital with severe injuries.

The attack came four months after at least a dozen people attacked a bicyclist on the trail, about three blocks south. Police said they have made no arrests in that case and could not say whether the incidents were related.

Thursday’s attack occurred about 9:15 p.m. The victim told police that 10 men ages 18 to 22 were in front of him, near the 600 block of Rhode Island Avenue. The victim said he was on his cellphone when he heard a man say, “Let’s get him.”

Police said he was pushed to the ground and beaten in the head. They said the robbers took personal items and $260.

It was not immediately clear where the man was going, but authorities said it was either to his home or to a Metro stop.