With further rain looming, more families have abandoned their homes in Paraguay, the country hardest hit by the worst flooding in decades in the area bordering Uruguay and Argentina.
The floods have already forced more than 100,000 people to evacuate.
The weather phenomenon El Nino has exacerbated summer rains, swelling rivers in the region. The River Paraguay, which flows by the country's capital, Asuncion, has already reached 7.82m, its highest level since 1992.
Around 90,000 people have already left their homes in Asuncion. In Alberdi, about 120km further south, authorities have called for 7000 people to evacuate because of cracks detected in the town's levee.
"We are very uncertain about what could happen with the [flood] wall and we do not want to run any type of risk, so the population has been alerted," said Paraguay's Minister of National Emergencies, Joaqun Roa. This year's El Nino, which causes global climate extremes, is the worst in more than 15 years, the United Nations weather agency said last month.