we have a team of correspondents covering the attacks and we begin with charlie daggett at brussels airport>> both brothers, one of them here at the airport, the other at the subway station. a third man is on the run. he left behind the biggest bomb, one that failed to detonate until the bomb squad arrived. one of the most heartbreaking things about yesterday's savage suicide attacks on the brussels airport and the bomb packed with nails that ripped through the crowded subway car at rush hour is the growing sense they could have and should have been stopped. after the airport attacks, police released this picture of the suspects casually pushing leggage thought to be carrying explosives. the man in the middle has been identified as ibrahim el bakraoui. e and his brother, khalid, were already known to belgian police as petty gangster. ibrahim is thought to have blown himself up at the airport, khalid is the key suspect in the train bombing. but the man in the hat has not been identified by police. belgian media has named him as najim laachraoui, the suspected bombmaker. investigators believe