BOGOTA, Colombia — An avalanche of water from three overflowing rivers tore through a small city in Colombia while people slept, destroying homes, sweeping away cars and killing at least 193 unsuspecting residents. Close Ad X The incident triggered by a sudden, heavy rainstorm happened around midnight in Mocoa, a provincial capital of about 40,000 tucked between mountains near Colombia's southern border with Ecuador. Muddy water quickly surged through the city's streets, toppling homes, ripping trees from their roots and carrying a torrent of rocks and debris downstream. Many residents did not have enough time to flee. According to the Red Cross, 202 people were injured and 220 believed missing. President Juan Manuel Santos declared a state of emergency and said the death toll will likely rise but warned against speculating about how many are dead. Late Saturday, he said the toll had reached 193. "We don't know how many there are going to be...