At least five people were killed and some 100 injured, including foreigners, in a series of explosions on Indonesia’s popular resort island of Bali, police and hospital officials said on Saturday. One police officer said the explosions had occurred simultaneously, one of them not far from the US consulate on Bali. Police said there were two blasts.‘‘At this stage there are five dead. It could be up to 100 hurt,’’ said the officer.Eyewitnesses spoke of chaos in the area near one of the explosions, at the Sari nightclub around the famous Kuta beach strip, as foreign tourists were revelling on a typical Saturday night. One witness said windows on shops had been blown out up to 500 metres away. He heard at least three explosions on the island in Indonesia. ‘‘I saw one man, who looked Indonesian, whose head had been blown off,’’ the witness said.