ECTOR COUNTY - Firefighters still don't know what caused a grassfire in Odessa on Sunday.
Smoke filled the sky when some 400 acres went up in flames around 2:30 Sunday afternoon.
Firefighters from Odessa, south Ector County, Midland, and Gardendale spent four hours trying to get a handle on the raging grassfire.
The cause is still under investigation.
No one was hurt.