Blast at Portuguese fireworks factory

At least four people have been killed in an explosion at a fireworkers factory in Portugal, officials say.

The blast has reportedly started a fire in a pine forest near the factory, in the town of Caldelas, about 50km (30 miles) from the city of Oporto.

"We can confirm four dead but there may be more bodies inside," said a spokesman for the emergency services in the capital, Lisbon.

Media reports said the factory had only four workers.

The state television channel, RTP, said five people had died.