Prosecutors said the bodies of a man and woman were found separately Tuesday under the 15-metre (50-foot) pile of rubble on Rue d'Aubagne, a narrow shopping street which now resembles the scene of an natural disaster.
The collapse has highlighted concerns over the condition of up to 6,000 buildings in Marseille, which have been estimated to be in similarly poor fix.
Castaner said at the site that 120 police officers and 80 firefighters took part in the search-and-rescue operation, working day and night in the pile of beams and rubble.
Donald Trump fires US Attorney General Jeff Sessions
Both Whitaker and Clovis are rooted in Iowa politics, and both ran for the 2014 Republican Senate nomination. But Senate Judiciary Chairman Chuck Grassley praised Whitaker. "I'm profoundly concerned about it", he said.
There are between five to eight people missing, Interior Minister Christophe Castaner said late Monday, with authorities trying to trace five residents and three other people who had been invited to the buildings.
People had been living in nine of the 10 apartments at number 65, while a shop occupied the ground floor.
"It's hell here, they know that it's crap and now people die for nothing", said local resident Toufik Ben Rhouma. It was not immediately clear why they collapsed, or how many people the apartment building housed.
"It could have been me", she added, visibly shaken.
1 dead in Melbourne stabbing; man attacked cops before being shot
Videos and photos shared on Twitter showed a burning vehicle and police officers in an altercation with the man clad in black. James Gargasoulas is accused of deliberately crashing into pedestrians, killing six and injuring 27 others.
The neighbourhood is home to many buildings in a similarly dilapidated condition, some of them run by slum landlords.
The buildings were in a small shopping street in the centre of the city. In 2011 the local authorities began a plan to renovate the city centre, but a 2015 government report suggested that 100,000 Marseille residents were living in housing unsafe to their health or security.
"It's unthinkable that such things happen in our time", said Christian Gouverneur, who owns a flat in an apartment block opposite the collapsed buildings.
Danny Welbeck injury: Has Welbeck played his last game for Arsenal?
He added: "Our mind is to be first in the group". "Then the objective is to come back with us and grow with this experience".