New Delhi: Four tremors hit Nepal in quick succession Tuesday, 18 days after a massive earthquake devastated the Himalayan kingdom.

Four people are reported dead in the Nepali town of Chautara, capital of Sindhupalchowk district, which suffered the heaviest death toll in the 7.9 magnitude quake on April 25. Several buildings in Kathmandu have collapsed.

Large tremors were also felt across India as far away as Chennai, capital of Tamil Nadu state.

“My feet are still trembling. We are all terrified,” Sister Lisa Perekkatt, superior of Sisters of Charity of Nazareth convent in Kathmandu told Matters India immediately after a series of tremors sent terrified residents running onto the streets in Kathmandu.

Sister Perekkatt said everyone in their Navjyoti Centre ran out into the open as the tremors began around 1 pm. She said they were engaged in relief works among the survivors of the previous quake when the serial tremor struck Nepal. A person was wounded when the boundary wall of a temple near their convent was collapsed, she said.

The new tremors have forced the relief workers to stop work temporarily, she added.

In India, a Home Ministry spokesperson told reporters that two near-simultaneous earthquakes with epicenters in Nepal and Afghanistan hit India.

People rushed out of their homes and offices in cities in the national capital. The metro service in the capital was halted for a few minutes. Two people are reported killed in Bihar, which borders Nepal.

Prime Minister Narendra Modi held a meeting with top officials to review the situation. Home Minister Rajnath Singh said that emergency relief teams are on standby. “India is ready to provide all the support which Nepal would require,” the minister told reporters.

The largest of the four quakes that shook Nepal today was measured at 7.3 on the Richter Scale; its epicenter was between Kathmandu and Mount Everest, according to the US Geological Survey. The airport in Kathmandu was shut down.

More than 8,000 people were killed and hundreds of villages destroyed in the April 25 quake. It also left nearly 18,000 people injured and tens of thousands homeless. Nearly 80 people had died in Bengal and Bihar.

Like April’s earthquake, today’s was shallow – 15 km deep. Shallow quakes are more deadly because the amount of energy released is focused over a smaller area.