Toulouse siege continues.

The police siege of a building in Toulouse where a man suspected of killing seven people is holed up has entered a second day, according to BBC.

Late on Wednesday gunfire and at least one explosion were heard at the block of flats in north of the city.

Earlier, three more blasts were heard, accompanied by flashes of orange light.

Mohammed Merah, 23, is suspected of killing four people at a Jewish school last Monday and three soldiers in two attacks last week.

After the first explosions, deputy mayor Jean-Pierre Havrin told local media that "negotiations have finished and the assault has begun".

However, sources from the French interior ministry have since been quoted as saying said this was beginning of an operation to put pressure on Merah.

Police had been negotiating with Merah but had not convinced him to surrender.