The mall is located outside the city centre, a reporter at the scene told dpa. He said the "massive" blast on Sunday afternoon was likely caused by improperly stored fireworks that ignited. According to rescue workers, there could still be people under the rubble. Several buildings collapsed or were damaged. The blaze created a large cloud of smoke that spread over the city. Dust and debris settled over cars. At least seven people had to be hospitalized for treatment, the Civil Defence Ministry said. Many people ran reportedly ran for their lives. The former Soviet Republic of Armenia in the South Caucasus is one of the world's poorest countries. Violations of safety regulations are common.