The police have arrested 15 members of a hardline Hindu group, Bajrang Dal, in connection with the attack. 'Apology demanded'Bajrang Dal activists are alleged to have attacked the priest, Oscar Mendonza, in Thane district last week. They demand an apology from him for the murder of some Hindu activists in the north-eastern state of Tripura nearly two years ago - allegedly by Christians. When the priest refused, he was beaten up and the church vandalised. The Bajrang Dal has denied any involvement in the attack.However, it has refused to join a meeting of other political parties called for Independence Day on 15 August to condemn the incident. This is the latest in a series of anti-Christian violence by ultra-nationalist Hindu groups in recent years. Such incidents have, however, mainly been reported from the predominantly tribal regions of Orissa, Gujarat, Bihar and Madhya Pradesh. Its occurrence in a big city such as Bombay is believed to be a cause for concern for the authorities.