Big explosion hits Rio de Janeiro; 7 hurt in blast

Rescue workers search for victims after an explosion in Rio de Janeiro, Monday, Oct. 19, 2015. Dozens of commercial and residential buildings in northern Rio de Janeiro were destroyed or severely damaged in the early Monday explosion, but authorities say despite the damage, as yet, nobody was reported killed. Officials suspect a gas leak was the cause of the blast. (AP Photo/Felipe Dana)

Rescue workers search for victims after an explosion in Rio de Janeiro, Monday, Oct. 19, 2015. Dozens of commercial and residential buildings in northern Rio de Janeiro were destroyed or severely damaged in the early Monday explosion, but authorities say despite the damage, as yet, nobody was reported killed. Officials suspect a gas leak was the cause of the blast. (AP Photo/Felipe Dana)

People watch as rescue workers search for victims after an explosion in Rio de Janeiro, Monday, Oct. 19, 2015. Dozens of commercial and residential buildings in northern Rio de Janeiro were destroyed or severely damaged in the early Monday explosion. Officials suspect a gas leak was the cause of the blast. (AP Photo/Felipe Dana)

The interior of a restaurant is seen damaged after an explosion in Rio de Janeiro, Monday, Oct. 19, 2015. Dozens of commercial and residential buildings in northern Rio de Janeiro were destroyed or severely damaged in the early Monday explosion. Officials suspect a gas leak was the cause of the blast. (AP Photo/Felipe Dana)

Rescue workers search for victims after an explosion in Rio de Janeiro, Monday, Oct. 19, 2015. Dozens of commercial and residential buildings in northern Rio de Janeiro were destroyed or severely damaged in the early Monday explosion. Officials suspect a gas leak was the cause of the blast. (AP Photo/Felipe Dana)