Authorities say an argument over a break room light led to a deadly stabbing involving three workers at Philadelphia International airport, the AP reports. The stabbing occurred around 11:30am Thursday near Gate E6 in what city police say was a "secure area"; NBC Philadelphia says it was a break room for Worldwide Flight Services, an airplane cleaning contractor for Frontier Airlines, that is located on the tarmac. The men's names weren't released. Police say one worker turned off a break room light, angering another worker. The third worker soon pulled out a knife, cutting one of the men across the abdomen. The 28-year-old stabbing victim was pronounced dead at a hospital. Authorities say the two other workers ran off but were soon confronted by police. It wasn't clear what charges they may face. (More stabbing stories.)