The building, in the Wilson area of Reims, is described as social housing dating back to the 1960s.
BBC: Reims blast and building collapse in France kills three
Michel Bernard, the top government official in Reims, told The Associated Press that one person was seriously injured.
Lyon remains in second place following a crushing 4-0 win at Bordeaux, while Reims and Saint-Etienne shared a 1-1 draw.
The much larger Reims had lots of suburban development and malls on the periphery, unlike the tighter, more classic Epernay.
FORBES: Scenes from the French Art of Living: A Perfect Hotel Stay in Champagne
In a statement, President Francois Hollande sent his condolences to the victims' families and his solidarity to the city of Reims.
BBC: Reims blast and building collapse in France kills three
Reims mayor Adeline Hazan told France's BFM television that "a very powerful explosion" had taken place, blowing out windows of nearby buildings.
With this in mind, the Reims school recently appointed an academic to the enviable post of the world's first professor of Champagne.
The Senegalese on the list is Basile Yehoume, born in Dakar and who played at Stade Reims in France's Ligue 1 last season.
At the time, Germany was an important market for champagne, and many Germans, including Johann-Josef Krug, were coming to Reims to set up business.
Reims Management School is based in the north-eastern French city of the same name, which itself is located in the heart of the Champagne-Ardenne region.
Things did not get off to a great start in Reims.
FORBES: Scenes from the French Art of Living: A Perfect Hotel Stay in Champagne
Comminges, who has just picked up the Supporters Club's Player of the Year award, joined Swindon from French Ligue 2 side Stade de Reims last July.
The best thing to happen in Champagne since the restoration of the bombed-out Reims cathedral after the Armistice is the rise of the grower Champagne movement.
In another recent French example two nearby schools ESC Rouen and Reims launched a joint campus in Paris, which itself may evolve into a fully-fledged merger.
There was a glimmer of regret when I finally got to Reims Cathedral, where there was no one with whom to marvel at the incredible story of Joan of Arc.
Was the Epernay success to be followed by Reims desastre?
FORBES: Scenes from the French Art of Living: A Perfect Hotel Stay in Champagne
"The explosion of a residential building in Reims is a terrible drama, " the office of French President Francois Hollande said in a statement, conveying his condolences to the victims' relatives.
More than 100 rescue workers, firefighters, sniffer-dog squads and bomb and gas experts were deployed to the gutted building in a subsidized housing complex in the city of Reims, east of Paris, officials said.
Last June, TGV Est opened in France, slashing journey times between Paris and Reims to 45 minutes from 90 minutes, and from Paris to Strasbourg in 2 hour 20 minutes instead of 4 hours.
Most painfully, as I thought ahead to my stay, the hotel I could not find was in a strange area, just a few grubby steps outside Reims proper, in a little non-descript town called Tinqueux.
FORBES: Scenes from the French Art of Living: A Perfect Hotel Stay in Champagne
REIMS, France (AP) A possible gas explosion ripped off the side of a five-story residential building in France's Champagne country on Sunday, killing at least two people and injuring at least 10 others, officials said.
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