The NFL's best defense held Houston scoreless after halftime.
DETROIT -- Reggie Bush's 37-yard touchdown run helped Detroit score 27 points in the second quarter and he accounted for 173 yards of offense to help the Lions beat the Chicago Bears, 40-32.
Detroit (3-1) moved into a first-place tie with Chicago (3-1) in the NFC North. The Lions scored 24 straight points, including three TDs in a span of 3 minutes, 26 second, after Matt Forte's 53-yard TD run gave the Bears 10-6 lead early in the second quarter.
Jay Cutler, who had four turnovers, threw a pair of touchdown passes and 2-point conversions in the final 4 minutes to pull Chicago within eight points to make the score look respectable.
Lions receiver Kris Durham recovered the onside kick to seal the win.
LONDON -- Greg Jennings made two touchdown catches, Adrian Peterson ran for two scores and the Vikings' defense made a big stop with time running out to preserve a 34-27 win over the Steelers on Sunday for their first win of the season.
Playing at Wembley Stadium, Everson Griffen stripped Ben Roethlisberger on the 6-yard line with 19 seconds left. Kevin Williams recovered to seal the victory.
Jennings made a 70-yard catch-and-run for a touchdown and Peterson had a 60-yard score to help offset two scores by Pittsburgh rookie running back Le'Veon Bell and give Minnesota (1-3) some hope of turning its season around.
The Steelers fell to 0-4 for the first time since 1968.
Vikings quarterback Matt Cassel, starting in place of injured Christian Ponder, finished 16 of 25 for 248 yards and two touchdowns.
Roethlisberger was 36 for 51 for 383 yards, with one touchdown and one interception.
KANSAS CITY, Mo. -- Alex Smith threw three touchdown passes, Dexter McCluster returned a punt 89 yards for another score and the unbeaten Kansas City Chiefs plunged the New York Giants to 0-4 with a 24-7 victory.
Smith hit touchdown passes of 4, 2 and 35 yards for the Chiefs (4-0), who under Andy Reid have already doubled their victory total of 2012. They are the second team to go from a two-win season to 4-0 the next year.
The Giants, who trailed only 17-7 after three quarters, are 0-4 for the first time since 1987.
Eli Manning connected with Victor Cruz on a 69-yard scoring play for New York's only score. The Kansas City defense sacked Manning three times. Smith was intercepted twice, the first giveaways by the Chiefs, who also lost a fumble.