The Vikings began their opening home game of the season without Adrian Peterson, who was deactivated after being charged with negligent injury of a child for allegedly beating his four-year-old son with a tree branch. He was replaced in the starting lineup by Matt Asiata, who got the Vikings off to a good start with a 25-yard touchdown reception from Matt Cassel on the game's opening possession. The defense then forced the Patriots into a three-and-out, only for Cassel to throw an interception attempting to find Jarius Wright deep downfield. Devin McCourty returned the ball 60 yards to the Minnesota 1-yard line, and two plays later, Stevan Ridley ran in to tie the scores. A second interception early in the second quarter resulted in another scoring drive for New England, as Tom Brady connected with Julian Edelman on a nine-yard TD catch. As the first half drew to a close, the Vikings drove downfield to give Blair Walsh a 48-yard field goal attempt with 19 seconds on the clock; however, Patriots DE Chandler Jones was able to burst through the Minnesota offensive line and block the kick before scooping up the ball and returning it 58 yards for the Patriots' third TD of the half. After the break, Cassel threw another two interceptions, one in each quarter, with the first resulting in a 47-yard Stephen Gostkowski field goal. The second occurred with six minutes left in the game, and the Patriots were able to hang onto possession until the two-minute warning before turning the ball over on downs at the Minnesota 19-yard line. Aided by two pass interference penalties, Cassel led the Vikings down the field and thought he had managed to cut into the New England lead with a 16-yard pass to Greg Jennings with 41 seconds to play, only for Jennings to be ruled out of bounds before gaining possession of the ball. Cassel was then sacked for a 14-yard loss on the next play and the game finished as a 30-7 Patriots win.
Question: How many interceptions did Cassel throw?
Answer: 4