The 30 Seconds to Mars frontman was leaving Los Angeles' LAX airport after arriving on a flight when the alleged incident occurred, reports.

According to the website, Leto and a friend were about to get into a car when they became embroiled in a dispute with a male snapper, who was reportedly left with a bloody lip. It is unclear what led to the spat.

Police officers are believed to have questioned all parties involved, including Leto and his pal, but determined no further action was necessary.