Answer based on context:

After dropping their first four games of the season, the Indianapolis Colts came back to Lucas Oil Stadium to take on the Kansas City Chiefs.  The game opened well for the Colts, who scored on their opening drive with a Curtis Painter to Pierre Gar&#231;on touchdown reception. In the second quarter, the Colts scored with an Adam Vinatieri field goal and another Painter to Gar&#231;on touchdown, giving Indianapolis a 17-0 lead midway through the second quarter.  A Kansas City touchdown pass from Matt Cassel ended the shutout but Indianapolis scored another touchdown later. A late Kansas City touchdown allowed the Colts to go into halftime with a 24-14 lead. Two touchdown passes from Cassel, to Dwayne Bowe and Steve Breaston respectively, gave the Chiefs 21 unanswered points and completed the comeback, winning the game 28-24, dropping the Colts to 0-5 on the season.

How many points did the Colts lead going into halftime?
10