A duty officer with the Maryland State Police Rockville Barrack, which was the lead investigating agency, said all outer-loop lanes of the highway were closed beginning about 7:50 p.m. and remained closed as of 10 p.m. He said police did not have an estimate for when lanes would reopen.
The state police duty officer, who identified himself only as Cpl. D. Parker, said he could not confirm the number of injuries because officers were still gathering information at the scene.
The accident occurred prior to exit 33 for Connecticut Avenue, according to Parker.
No further information was immediately available.