UPDATE:

TxDOT says all lanes on I-2 are now open.  

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The Texas Department of Transportation says the eastbound lanes of I-2 are now open.

Officials advise that the westbound main lanes remain closed in the Valverde area. 

 Drivers are advised to find alternate routes.

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Alamo officials are advising of lane closures on the expressway due to a major accident.

According to authorities, an 18-wheeler is sprawled across the east and westbound of the expressway.

Delays are expected to last from 2 to 4 hours said authorities.

No injuries have been reported.

The Texas Department of Transportation said traffic is being rerouted to Frontage Road. 

CBS 4 will update this story as more details become available.