GREENWICH TWP., Pa. – Interstate 78 East in Berks County will likely remain closed well into the afternoon as crews work to clear the scene of an accident involving a tractor trailer and a box truck hauling mail. The accident happened at 5:23 a.m. Tuesday in the eastbound lanes of the highway, near milepost 39.3, in Greenwich Township. The impact of the crash sent the box truck down an embankment and into a wooded area. Mail could be seen scattered on the ground around the wreckage. U.S. Postal Service workers responded to the scene to gather the spilled mail.