An earthquake of moderate intensity rocked northeastern India early Tuesday triggering panic among residents of the region, news reports said. The epicenter of the quake, measuring 5.7 on the Richter scale, was located in the northeastern state of Sikkim, officials of the state's weather office said. The tremor shook the states of Sikkim, Assam, Meghalaya, Arunachal Pradesh, Manipur and northern West Bengal, IANS news agency reported. Officials in the northeastern states said there were no immediate reports of casualties or heavy damage.