The first block of East Washington Street was closed for at least an hour Tuesday night after a child set off a sprinkler system in an apartment building, a fire official said.
The street was reopened at 10 p.m., fire officials said.
A child standing on a bunkbed and swinging a toy hit the bulb on a sprinkler head in a fourth-floor apartment, causing water to seep to the floors below, said Battalion Chief Ron Horn of the Hagerstown Fire Department.
The water seeped through apartments and CW Travel, a travel agency owned by Mike Pishvaian at 31 E. Washington St.
Pishvaian could not be reached for comment Tuesday night.
Water only seeped through the east side of the five-story building at 29-33 E. Washington St. The travel agency takes up the entire first floor.
Horn said he did not have a damage estimate.
Firefighters covered computers and desks in the travel agency office and used water vacuums to suck water out of the carpeting.