Henry Colombi

AUSTIN, Texas (AP) — Casey Thompson threw five touchdowns and ran for another as Texas continued its offensive explosion since naming him the starting quarterback with a 70-35 rout of Texas Tech on Saturday.

With Thompson at the controls of the offense, the Longhorns have scored more than 40 points in the first half in consecutive games while mixing Thompson's ever-expanding role as a passer with a powerful running game.

Thompson was 18-of-23 passing for 303 yards and ran for a score in the first half. Hudson Card started the first two games for Texas (3-1, 1-0 Big 12), but was replaced by Thompson after the Longhorns struggled badly in a road loss at Arkansas.

Texas scored on all five of its possessions in the first half against Texas Tech and added a 27-year interception return by Josh Thompson. Three of Casey Thompson's touchdown throws went to freshman Xavier Worthy, including a 23-yard touch pass into end zone coverage, and a 62-yard score when Worthy broke two tackles and sprinted away from two defenders.

Texas scored 70 points for the first time since beating Colorado 70-3 in the 2005 Big 12 championship game.

Bijan Robinson ran for 137 yards and scored Texas' first touchdown. Roschon Johnson added two rushing touchdowns for the Longhorns.

Texas Tech quarterback Henry Colombi passed for 324 yards and three touchdowns for Texas Tech (3-1, 0-1) after coming on for injured started Tyler Shough in the second quarter.

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Texas Tech plays at West Virginia next Saturday.

Texas plays next Saturday at TCU, where the Longhorns haven't won since 2013.