As many as 33 people have been killed by lightning during a vicious thunderstorm that lashed the northern Indian state of Uttar Pradesh, according to reports.

Thirteen other people were injured by lightning and 20 houses collapsed during the Sunday storm, according to Weather.com, which cited Sanddhya, a disaster relief official who only goes by one name.

J.P. Gupta of the Indian Meteorological Department said that a low pressure area developed, forming a squall line.

Heavy rains and lightning struck when farmers were working in the fields.

Among those killed were seven people, including a woman and a child, who were working in a paddy field, police officer Pradyuman Singh said.

Yogi Adityanath, Uttar Pradesh’s chief minister, said the relatives of those who died would receive compensation of 400,000 rupees, or about $6,000.

Lightning strikes are common in India from June to September during heavy monsoons, according to the BBC.

At least 2,000 people have died in lightning strikes in the country every year since 2005, according to government records.

With Post wires