The United Arab Emirates saw its heaviest rainfall on record Wednesday, which caused severe flooding and disrupted operations at one of the world’s busiest airports, while flash flooding in neighboring Oman killed nearly 20 people.

Heavy rains also lashed neighboring Oman on Tuesday, with some parts of the country receiving more than 7 inches of rain since the start of the week. The severe weather triggered flash flooding in parts of the country, causing at least 19 deaths, national emergency authorities said. The death toll includes an infant and 12 school children whose school bus was swept away by flood waters.