At least 15 people have been killed and scores injured in a series of explosions in northern India.The blasts occured in the Hindu pilgrimage city of Varansi. Authorities say one bomb went off in a packed Hindu temple and up to two others exploded in a local railway station. Another device was recovered from a residential area and was being defused. The three explosions occured between 6 p.m and 6.45 p.m (1230-1315GMT) according to police. The Sankat Mochan temple is usually packed with thousands of devotees on Tuesday, as it is considered particularly holy to most Hindus. The attack has sparked fears of sectarian strife in Uttar Pradesh, India’s most populous state, which has a history of Hindu-Muslim clashes. No group claimed responsibility for the blasts. Most previous attacks on Hindu temples in India have been blamed on Islamic militants. Authorities have ordered increased security across northern India to prevent any clashes between the country’s majority Hindus and minority Muslims.