Strong tremors were felt in several places in Tamil Nadu on April 11 following a massive earthquake in Indonesia, with people coming out of their homes and some schools moving students into open grounds. According to reports, tremors were felt in Chennai, Madurai, Coimbatore, Nagapattinam and other areas. The earthquake had its epicentre off the west coast of northern Sumatra and occurred at 2.08 p.m., the IMD said. It led to a tsunami warning in 28 countries, including India. It brought back memories of the 2004 tsunami that saw more than 7,000 people being killed in Tamil Nadu's coastal areas.