Earlier Monday, two bombs went off near the finish line at the Boston Marathon. Three people were killed and at least 140 were injured.
Wahlberg said he didn't even want to come to the premiere he was so upset. He said he was disgusted by the attack.
Rapper 50 Cent was also at the premiere. He said there's no explanation for why it happened, especially since kids were involved. An 8-year-old boy was among the dead.
Authorities are still trying to determine who was behind the deadly assault.