Rescuing work is going on at Dharahara Tower.

Among the Kathmandu landmarks destroyed by the quake was the 60-metre-high Dharahara Tower, built in 1832 for the queen of Nepal, with a viewing balcony that had been open to visitors for the last 10 years.

A jagged stump just 10 metres high was all that was left of the lighthouse-like structure. As bodies were pulled out of the ruins, a policeman said up to 200 people had been trapped inside.

At the main hospital in Kathmandu, volunteers formed human chains to clear the way for ambulances to bring in the injured.

Across the city, rescuers scrabbled through the rubble of destroyed buildings, among them ancient, wooden Hindu temples.

"I can see three bodies of monks trapped in the debris of a collapsed building near a monastery," said Pant, the tourist. "We are trying to pull the bodies out and look for anyone who is trapped."