11:15 a.m. Saturday update — Alexandria police said they won't release any additional information on Friday afternoon's robbery until Monday when the department will likely issue a press release with more details from case detectives.

Police are investigating a Friday afternoon robbery of the Del Ray post office in the 1900 block of Mount Vernon Avenue.

Hildebrandt did not know the exact time the incident took place. Police were on the scene shortly after 4 p.m.

A man entered the post office, implied a weapon and demanded cash, Alexandria Police Department spokesperson Ashley Hildebrandt said.

The suspect exited the post office with an undisclosed amount of money and entered a vehicle and left the area.

There were no injuries, Hildebrandt said.