A fire swept through tents at a trade fair in northern India Monday, killing at least 45 people, police said.

The fire broke out at a consumer electronics show in the town of Meerut, about 350 miles from the city of Lucknow.

"At this point we have 45 dead. The number may go up," said Rakesh Tomar, a Meerut police officer.

It was not immediately clear what caused the fire.

Trade fairs, where manufacturers and traders set up stalls to exhibit their wares to consumers and other businesses, are common in India. They are commonly held in elaborate cloth tents set up over interconnected bamboo poles and often with little regard for safety regulations.