. >>> meanwhile, philadelphia police commissioner richard rot, saying the city on highs ends alert, nacred many threats here in the sit. >> i "eyewitness news" reporter greg argos live at philadelphia international airport, where greg, travelers can see and expected or increased security presence? >> reporter: that's right, guys, in fact, right now, safety, security, top of mind for anyone traveling here at philadelphia international airport. some passengers, though, say they're on edge after the terror attacks in belgium that killed dozens, now, pass ends ers arriving or departing here at philadelphia international airport can expect to see that increase in security. both at the international and domestic gate. this after isis claiming responsibility for deadly explosions, that rocked both brussels, main airport, and train stations, killing dozens, and injuring more than 100. here in philadelphia, this afternoon, word spread about the attacks overseas, passengers say they're glad for this extra security. >> i think that a lot of airports try to make sure we all feel safe and secure, know