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SAN ANTONIO – A jackknifed 18-wheeler forced the closure of an exit on the Southwest Side Friday morning.

The crash happened around 10 a.m. in the northbound lanes of Interstate 35 South at Loop 1604 near Quintana Road.

TxDOT says the exit from I-35 North to Loop 1604 is closed. It is unclear when it will reopen.

Drivers are urged to avoid the area if possible.