Four knife-point robberies were reported Sunday on or next to the popular Metropolitan Branch biking and hiking trail in Northeast Washington, D.C. police said.

Police said that the incidents appeared connected and that the victims were asked to surrender their cellphones and numeric codes.

In each case, police said, the victims were confronted by one or two black men, described as in their late teens or early 20s. They were said to be between 5 feet 6 and 5 feet 11. In what appeared to be the most distinctive characteristic described, one of the robbers was said to have a bush pony tail, according to the police.

The robberies were reported at various times during the day from about 11 a.m. to 7:30 p.m., in areas near the 700 block of Edgewood Street NE, the 500 block of V Street NE and the 2800 block of Eighth Street NE.

No injuries were described in preliminary police reports.