A strong earthquake measuring over 6.0 on the Richter Scale hit both Bangladesh and India in a span of 30 minutes early on Wednesday morning, authorities in both the countries said.   In Bangladesh, strong tremors were felt at 8.21am in different parts of the country, including the capital, according to Sheikh Hanif of the Dhaka Met office.   In neighbouring India, the quake shook the states of Assam in the northeast and West Bengal in the east at 7.51 am, the National Centre for Seismology said.   The epicentre of the earthquake in India was 43 km west of Assam's Tezpur in the state’s Sonitpur district, the Center said. Also read: 5.1 magnitude earthquake jolts Dhaka "Big earthquake hits Assam. I pray for the well being of all and urge everyone to stay alert. Taking updates from all districts," Assam's Chief Minister Sarbananda Sonowal tweeted. Though there have been no reports of any casualties in both the countries, local TV channels in India reported that several houses in Assam have developed cracks. Also read: 5.8 magnitude earthquake jolts Dhaka, other areas again