UPDATE - Thursday - 6/20/2013, 11:15am ET - All lanes have reopened.
UPDATE - Thursday - 6/20/2013, 10:20am ET - Three right lanes are now open. One lane remains blocked.
UPDATE - Thursday - 6/20/2013, 9:38am ET - Two right lanes reopen.
UPDATE - Thursday - 6/20/2013, 9:31am ET - Right lane of southbound I-5 reopens.
EARLIER - Thursday - 6/20/2013, 6:03am ET
WASHINGTON - All lanes of southbound Interstate 95 leaving Baltimore County are closed at Exit 49 because of a crash involving two tractor-trailers.
The crash is just before the Baltimore Beltway and is affecting traffic into Howard County.
Traffic is being diverted off I-95 at Caton Avenue. Traffic stuck behind the crash is being turned around traffic on the median.
Northbound lanes of I-95 that had been blocked have reopened.
The crash occurred just before 4:30 a.m.
See the scene of the crash on this Maryland Department of Transportation traffic camera.