A powerful earthquake has rocked Indonesia, leaving more than 3,000 people dead and thousands more injured.The 6.2 magnitude quake flattened buildings in a densely-populated area near the city of Yogyakarta, the former ancient capital on the main island of Java. Morgue officials say they are overwhelmed. With more bodies arriving every hour, there have been mass burials. Identification of victims has had to wait,as efforts focus on containing the outbreak of disease. Local hospitals are overflowing with the injured. Patients have been moved outside due to fears of aftershocks. Electricity and telecommunications are down across the city and, with the airport severely damaged and many major roads closed, it is unclear when help from outside will arrive. Yogyakarta is near the Mount Merapi volcano, which threatened to erupt earlier this month, forcing thousands of people to be evacuated. The earthquake is not thought to have been caused by the volcano, but there are reports of heightened activity in the area.