After three days of searching, Montgomery County Fire and Rescue crews have temporarily suspended their search for a missing swimmer in the Potomac River.

21-year-old Marco Reyes-Sanchez of Reston, Va. went missing on Wednesday after he and a friend were jumping off a cliff on the Virginia side of the Potomac River, near Sandy Landing, into the water. Reyes-Sanchez’s friend emerged from the water, but he did not.

Since Wednesday, crews have been meticulously searching for Reyes-Sanchez, but MCFR spokesman Pete Piringer says that he he is presumed dead and crews are suspending their search until tomorrow morning.