51.   The authorities at the airport had tightened security after receiving bomb threats earlier in the day.

52.   The appropriate authorities at every level also need to do away with artificial turf.

53.   The authorities at the scene said among the injured was a police officer who had been seriously wounded and was undergoing emergency surgery.

54.   The child is seen being shamed by a teacher and ostracized at school, resisting authority at every turn.

55.   The exasperated Chicago police sergeant called to alert the authorities at city hall.

56.   The fact that he was a born-in-the-United States citizen mattered little to federal authorities at the time.

57.   The merger could also be blocked or altered by competition authorities at the European Commission in Brussels.

58.   The prison authorities at Barask do not differ much from those in other parts of the world.

59.   The security efforts were complemented by thousands of volunteers who kept lines moving, directed pedestrian traffic near competition sites and helped the authorities at the various checkpoints.