He also described an April 20 shooting in Arcadia involving more than a dozen rival gang members. Arcadia police Lt. Ken Harper said the incident is still under investigation, but added police believe two groups of rival gang members accidentally encountered each other at the Dave and Busters bar in the Westfield Santa Anita mall. He said two victims survived gunshot wounds resulting from the clash. Witnesses to the Khounchanh killing described an assault bearing some similarities. One man, who watched “Spider-Man 3” in the same theater as Khounchanh, described a menacing group in the theater. “They were sitting right in front of us,” said the witness who refused to give his name for fear of retaliation. “They were trying to look for trouble.” Another witness recalled a commotion before the movie ended as several men rushed from the theater. The witness also refused to identify himself for fear of retaliation. “We left during the credits, about a minute or so after them,” the witness said. “There was some yelling. Some one said, `Shoot her, shoot her.”‘ [email protected] [email protected] (626) 962-8811, Ext. 2717, 2236160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! “We need the people close to the victim to provide the information they know,” said Covina police Detective Ric Walczack. “We need people to do the right thing and come forward.” Authorities described Khounchanh’s slaying as the most violent of three recent gang-related group attacks since late April. El Monte police Detective Steve Phan also works on the San Gabriel Valley’s Asian crime task force. He said the attacks could be the beginnings of a trend or a coincidence. “It could just be they’re all friends or part of some group,” he said. But the attacks have caught Phan’s attention. On May 1, he said, about 15 attackers surrounded a group half their size, yelled out a gang name and tried to stab about four victims. He said no one was seriously hurt because the knives used were not sharp, but three arrests were made. A fatal shooting at a Covina movie theater highlighted a recent spate in violent group attacks involving suspected Asian gang members over the past few weeks, authorities said. Early Monday, Jimmy Khounchanh, 21, of Baldwin Park, and his girlfriend were leaving the Covina AMC 30 theater in the 1400 block of North Azusa Avenue when he was attacked by several Asian males dressed in what police called “gang attire.” The girlfriend, whom police declined to name, drove through a hail of gunfire to get Khounchanh, an aspiring actor, to a hospital, where he was pronounced dead, authorities said. Detectives said witnesses have been slow to come forward. They have tried to track several down but fears of retaliation have hampered their investigation.