Apparent bomb explodes in Prince George's County, Maryland. Blast sets car on fire in Hyattsville parking garage.

From WUSA9.com:

Prince George’s County authorities are investigating a confirmed explosion in a parking garage near Prince George’s Plaza.

The explosion was reported at 12:19 p.m., in an underground parking garage in the 3300 block of East-West Highway.

About 200 people were evacuated from the building and many of them said they heard the explosion.

Prince George’s County Public Safety Director Vernon Herron said officials deployed their robot and made the determination that an explosive device did go off.

Herron said they are looking for a person of interest who was seen running from the area.

About four blocks of East-West Highway was quickly closed as a precaution but it was reopened shortly before 5 p.m.