Pakistan authorities on Wednesday arrested Hafiz Saeed, the alleged mastermind of a four-day militant attack on the Indian city of Mumbai in 2008, on terror finance charges, a spokesman for the chief minister of Punjab province said. The arrest came days before a visit to Washington by Prime Minister Imran Khan, who has vowed to crack down on militant groups operating in Pakistan. Saeed, designated a terrorist by the United States and the United Nations, is the founder of Lashkar-e-Taiba (LeT), or Army of the Pure, the militant group blamed by the United States and India for the Mumbai attacks, which killed more than 160 people.