Magnitude 6.8 quake in India, several dead

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"Cracks have developed in some buildings in Gangtok. Most phone lines are down and there is no electricity now. People have come out on the street," said Gangtok resident Bobby Dahal.

"It is too early to ascertain any damage. We are trying to get in touch with the state government of Sikkim to know if they need any help from us," Sujata Saunail, joint secretary of he National Disaster Management Authority, told Reuters.

Sikkim is India's least populous state, located in the Himalayas between Nepal, Bhutan and Tibet.

The quake was felt all the way to Bangladesh, shaking buildings in the capital and neighboring areas. At least 10 people were injured and some buildings suffered minor damages.

Thousands of panic-stricken families in Dhaka ran out of high-rise buildings on to the streets as the ground under their feet shook.

"I never experiences such a dreadful moment in my life. Suddenly lights went off and there was people running and crying around," said Shamsul Islam, a 70-year-old man in Chittagong port city in Bangladesh.

Several earthquakes have hit north and east India this year, but none have caused major damage or injuries.

(Reporting by Mayank Bhardwaj in New Delhi, Anis Ahmed and Serajul Quadir in Dhaka; Writing by Paul de Bendern; Editing by Alistair Scrutton)