JAKARTA (Reuters) - Pop star Lady Gaga has been refused a permit to perform in the Indonesian capital next month over security concerns, police said on Tuesday, after Islamic groups voiced strong objections to her "vulgar" style. Three Islamic groups have expressed their opposition to the concert on June 3, demanding it be stopped, national police spokesman Saud Usman Nasution said by telephone. Indonesia, a secular state, has the world's largest population of Muslims as well as significant minorities of Christians, Buddhists and Hindus. ...