KABUL, Afghanistan — Two Afghan lawmakers from the northeastern province of Takhar say its capital, Taleqan, has fallen to the Taliban. Taliban fighters have also seized most of the capital of northern Afghanistan’s key Kunduz province, as well as winning the month-long siege of the neighboring Taleqan. The advances were the latest in a series of blows to government forces as U.S. troops complete their pullout after two decades in the country. Two provincial council members said the Taliban took control of the governor’s office and police headquarters after a day of firefights, as well as the main prison building, where 500 inmates including Taliban fighters were freed. If Kunduz, capital of the province of the same name, falls, it would be a significant gain for the Taliban and a test of their ability to take and retain territory.