EAST MEADOW - Investigators are in Locust Valley today trying to figure out why a cement mixer truck drove under a narrow bridge before hitting a school bus.

The bus driver was killed and four special needs kids were rushed to the hospital yesterday afternoon. A 64-year-old male aboard the bus was also injured in the crash.

The bus driver has been identified as Jorge Guevara, 45, of Locust Valley. Guevara was pronounced dead at the scene.

Officials say the children are OK but the bus driver died after being crushed from the impact of the cement truck that weighed up to 80,000 pounds. The cement truck is owned by Nicolia Redi-Mix, of Lindenhurst. Police say the crash happened just before 3:30 p.m. on Oyster Bay Road, when the 44-year-old cement truck driver didn't clear the LIRR overpass.

According to officials, the barrel of cement was dislodged, causing the driver to lose control and hit the Locust Valley School District bus head-on.

The bus, carrying three 6-year-old boys and one 9-year-old boy, was coming home from an Oyster Bay Town group activities program for special needs kids run out of Syosset-Woodbury Park.

Both vehicles have been impounded for safety checks and the investigation is ongoing. School bus, cement truck collide in Locust Valley; 1 dead