<span style="color: #222222;">France's interior minister says four people have been killed, including two firefighters, and 47 injured in a blast at a bakery apparently caused by a gas leak in central Paris. </span><br />'' <br />'' <span style="color: #222222;">Christopher Castaner told reporters at the scene that of the injured 10 people are in critical condition and 37 others less seriously injured. </span><br />'' <br />'' <span style="color: #222222;">Police said a fire broke out after the blast at around 9 am local time at the bakery on Rue Trevise in the city's 9th district, a residential and shopping area. </span><br />'' <br />'' <span style="color: #222222;">Images posted on Twitter showed debris covering the street and the lower part of the building blown out and in flames. </span><br />'' <br />'' <span style="color: #222222;">Parked cars were also damaged in the blast. A gas leak had been reported in the building and firefighters had been on their way to deal with it when the explosion occurred.</span><br />'' <br />'' <span style="color: #222222;">Firefighters worked to extinguish the blaze and evacuate some people from the building using ladders while emergency workers treated some of the injured at the scene.</span><br />''