'Horton Hears A Who!' tops US box office

Dr Seuss adaptation Horton Hears A Who! has topped the US box office chart on its first week of release.

The Jim Carrey and Steve Carell comedy took over twice as much as last week's number one 10,000 B.C, which fell to second.

Other new entries came in the form of martial arts drama Never Back Down at number three and Neil Marshall's futuristic thriller Doomsday, which landed seventh spot.

The top ten in full:

1. (-) Horton Hears a Who! - $45,100,000
2. (1) 10,000 B.C. - $16,415,000
3. (-) Never Back Down - $8,610,000
4. (2) College Road Trip - $7,893,000
5. (3) Vantage Point - $5,400,000
6. (4) The Bank Job - $4,910,000
7. (-) Doomsday - $4,743,200
8. (5) Semi-Pro -$2,975,000
9. (7) The Other Boleyn Girl - $2,900,000
10. (6) The Spiderwick Chronicles - $2,390,000