French riot police (CRS) secure the area as shots are exchanged in Saint-Denis, France, near Paris, November 18, 2015 during an operation to catch fugitives from Friday night's deadly attacks in the French capital.[Photo/Agencies]

SAINT DENIS, France - A woman suicide bomber blew herself up and another militant died on Wednesday when police raided an apartment in the Paris suburb of St. Denis seeking suspects in last week's attacks in the French capital.

Officials said police had been hunting Abdelhamid Abaaoud, a Belgian Islamist militant accused of masterminding the Nov. 13 carnage, but more than seven hours after the launch of the pre-dawn raid it was still unclear if they had found him.

Seven people were arrested in the operation, which started with a barrage of gunfire, including three people who were pulled from the apartment, officials said.

"It is impossible to tell you who was arrested. We are in the process of verifying that. Everything will be done to determine who is who," Paris prosecutor Francois Molins said at the end of the operation.

Molins said the assault was ordered after phone taps and surveillance operations led police to believe that Abaaoud might have been in St. Denis, near to the soccer stadium which was site of one of the attacks that hit Paris last week.

A total of 129 people died in the coordinated bombings and shootings. Investigators believe the worst atrocity in France since World War Two was set in motion from Syria, with Islamist cells in neighbouring Belgium organising the mayhem.

Two police sources say investigators believe the St. Denis group had been planning an attack on the French capital's La Defense business capital.

Local residents spoke of their fear and panic as the shooting started in St. Denis just before 4.30 a.m. (0330 GMT).

"We could see bullets flying and laser beams out of the window. There were explosions. You could feel the whole building shake," said Sabrine, a downstairs neighbour from the apartment that was raided.

She told Europe 1 radio that she heard the people above her talking to each other, running around and reloading their guns.

Another local, Sanoko Abdulai, said that as the operation gathered pace, a young woman detonated an explosion.

"She had a bomb, that's for sure. The police didn't kill her, she blew herself up...," he told Reuters, without giving details.

Three police officers and a passerby were injured in the assault. A police dog was killed.

FLEEING RAQQA

Islamic State, which controls swathes of territory in Syria and Iraq, has claimed responsibility for the Paris attacks, saying they were in retaliation for French air raids against their positions over the past year.

France has called for a global coalition to defeat the radicals and has launched three large air strikes on Raqqa -- the de-facto Islamic State capital in northern Syria.

Russia has also targeted the city in retribution for the downing of a Russian airliner last month that killed 224 people.

The Syrian Observatory for Human Rights monitoring group said on Wednesday the bombardments have killed at least 33 Islamic State militants over the past three days.

Citing activists, the Observatory said Islamic State members and dozens of families of senior members had started fleeing Raqqa to relocate to Mosul in neighbouring Iraq.