KUALA LUMPUR—Torrential rains in Malaysia have caused flooding that has driven more than 11,000 people from their homes, closed dozens of roads, and disrupted shipping, authorities said on Saturday. More than 66,000 personnel from the police, army, and fire department have been mobilized nationwide to help rescue people stranded by flood waters and take them to shelters, Prime Minister Ismail Sabri Yaakob told a news conference late on Saturday. Floods in Malaysia are common during the annual monsoon season between October and March, particularly on the country’s eastern coast. But the downpour that started on Friday morning and continued into Saturday hit worst in the western state of Selangor—Malaysia’s wealthiest and most populous region surrounding the capital Kuala Lumpur. “It’s a bit chaotic in Selangor right now … in other states, preparations would be made earlier for the monsoon. But in Selangor, this happened almost suddenly,” Ismail Sabri said, adding …