At least 10 people were killed and another 10 reported missing following flash flooding triggered by heavy rain in the southern Brazilian town of Itaoca, authorities said Tuesday. A statement from Sao Paulo state's civil defense department said roughly 332 people -- or about 10 percent of Itaoca's population -- were left homeless by overflowing waters from the Palmital river. Itaoca, located 343 kilometers (216 miles) southwest of Sao Paulo, was still without power and drinking water, with 100 homes affected, officials said. Some 50 homes were also damaged in the nearby town of Apiai, they added. Sao Paulo Governor Geraldo Alckmin toured the area Monday and described the situation as "extremely serious." Forecasters are predicting more rain in the area over the next few days.