A US helicopter with 10 people on board has crashed in a rice paddy as it was trying to land at the Banda Aceh airport while on a tsunami relief operation, injuring at least two US soldiers. The US military suspended helicopter flights for about two hours after the crash. Also in Banda Aceh, an earthquake shook buildings and sent people scrambling from their homes early Monday, but no injuries or damage were reported. Strong aftershocks and security concerns have provided more challenges for aid workers two weeks after the tsunami. Aceh has accounted for about two-thirds of the 150,000 people known to have died in the disaster.