US rock band Aerosmith has cancelled a concert scheduled this week in Jakarta on safety concerns, a concert promoter said Sunday, following threats to bomb the Myanmar embassy in the Indonesian capital. "We received the official confirmation yesterday from the Aerosmith management cancelling the May 11 concert in Jakarta over safety concerns," said Sarah Deshita, spokeswoman for co-promoter Ismaya Live. "They gave no specific reasons for the cancellation. We are sad and disappointed over the decision. We did all we could to ensure security was tight and even engaged the marines but it's not enough," she told AFP. She said 85 percent of the 15,000 tickets to the concert had been sold. The band had apologised in the letter of cancellation, which was posted on the promoter's website. "Aersomith have been forced to cancel concert... due to safety concerns," the statement said. "We want to apologise to all our fans who were expecting to see us and hope that one day we can make it up to them," it added. Officials on Friday said two Indonesians have been detained over a plot to bomb the Myanmar embassy in Jakarta as radicals rallying in the city called for "jihad in Myanmar" to avenge the death of Muslims in clashes with Buddhists.