Their opponents from Saudi Arabia, however, spread out to various parts of the field in formation, with some players appearing to mill around.
The Saudi Arabian Football Federation (SAFF) said it "deeply regrets and unreservedly apologises for any offence caused" by the players' actions.
Authorities say he may be a foreign national, based on his accent.
Detectives and bomb disposal officers raided Abdulrahman Ali Alharbi's apartment last night in the Revere area of Boston and could be seen removing several bags of evidence, though he was not charged with anything.
His wife had been sitting in one of the seating sections where an explosion went off, but she had left her seat and was walking to meet up with him.
At Massachusetts General Hospital, Alasdair Conn, chief of emergency services, said: 'This is something I've never seen in my 25 years here ... This is what we expect from war.'Counter terrorism expert Rick Nelson, of the Center for Strategic & International Studies, said the number of co-ordinated blasts suggested a 'complexity' that would be difficult for an individual to carry out alone.
Multiple reports were flooding in in the moments after the attack, saying there were devices reported outside Harvard and other sites along the marathon route.
But today it was confirmed that there were only two devices.In the Senate meanwhile, Senator’s Chris Murphy, Al Franken and Rand Paul introduced a joint resolution of disapproval for the deal.