Chiefs and Steelers Tied, 21-21, at Halftime

Quarterback Patrick Mahomes tossed three touchdown passes in the first half for Kansas City

The Kansas City Chiefs are tied with the Pittsburgh Steelers, 21-21, at Heinz Field on Sunday afternoon.

Chiefs' quarterback Patrick Mahomes completed 8-of-10 passes for 119 yards and three touchdowns in the half, finding wide receiver Chris Conley, tight end Travis Kelce and tailback Kareem Hunt each for scores on Kansas City's first three drives.

It all added up to the Chiefs' most first-quarter points since Week 16 of the 2016 season as Mahomes became the youngest quarterback in NFL history to toss three first-quarter touchdowns, according to CBS.

Wide receiver Sammy Watkins also had a big half for Kansas City, tallying 102 total yards of offense on five touches.

The Steelers answered Kansas City's strong start with three scores of their own, as quarterback Ben Roethlisberger led Pittsburgh back from their early deficit with three touchdown passes.

Catch the second half of action on CBS (KCTV5 local) and 101.1 The Fox.

Photos from Chiefs at Steelers game at Heinz Field in Pittsburgh, Pennsylvania.