By Kanupriya Kapoor JAKARTA (Reuters) - Veteran U.S. rock band Aerosmith has not explained what security concerns prompted it last week to cancel a near sell-out concert in the Indonesian capital of Jakarta, the show's promoter said on Tuesday. "Our (preparations) were 90 percent ready when we got their cancellation letter one week before the concert," said Sarah Deshita of promoter Ismaya Live of the concert, which had been scheduled for May 11. "We had got police permits and offered Aerosmith the best security we have, including having a lot of Marines at the venue... ...