After an armed man was arrested at Phoenix Comicon Thursday, the convention organizers have heightened security, which includes banning costume props and limiting access to the convention center.

According to ABC 15 News, on Thursday, 31-year-old Mathew Sterling was taken into custody by local police at the Phoenix Convention Center after a brief struggle. Sterling was armed with three handguns, a shotgun, a knife, ammunition, and other handheld weapons, and was wearing body armor, according to officials. Police say Sterling allegedly posted on social media that he wanted to kill Phoenix police officers and a Comicon performer, who was identified during a court hearing as actor Jason David Frank, best known for appearing as the original Green Power Ranger.

The Arizona Republic covered the story, including Sterling’s appearance in Maricopa County Superior Court on Friday. He was charged with seven counts: attempted murder, three counts of aggravated assault with a deadly weapon, wearing body armor during the commission of a felony, resisting arrest and carrying a weapon in a prohibited place.

Phoenix Comicon Convention Director Matthew Solberg issued a statement on Thursday afternoon. “In light of recent events, Phoenix Comicon, in cooperation with the Phoenix Convention Center and the Phoenix Police Department, will be implementing enhanced screening to ensure the safety of all our attendees. This screening includes three dedicated access points, no longer allowing costume props within our Convention or the Convention Center, and other methods as determined in conjunction with the Convention Center and Phoenix Police Department. We anticipate some delays as you are entering the building and we encourage you to carry as little as possible to make the process easier.”

The changes took effect on Friday. The costume props ban included “foam and cardboard props, shields and sabers. Purchased props will be wrapped by the vendors and must remain so while they are on-site.” The ban included attendees, staff, crew, costuming groups, panelists, and participants in the masquerade ball.

Phoenix Comicon was originally founded in 2002 as Phoenix Cactus Comicon, and was held as a single day, six-hour event in Ahwatukee, Arizona. The convention has expanded and is now a four-day event (Thursday – Sunday). The 2016 attendance record was 106,096.