Dhaka, Oct. 1 -- The US federal government has shut down after lawmakers from both parties failed to reach a budget agreement, threatening widespread disruptions across the country. The impasse affects federal funding through October and could place about 40% of the workforce - roughly 800,000 employees - on unpaid leave.

Air travel disruption Travelers may face long security lines and flight delays as some unpaid air traffic controllers may choose to stay home, although essential staff at airports, including TSA agents, are required to work. Passport processing could also slow down, affecting Americans planning to travel abroad.

Federal employees and contractors Non-essential federal workers will be furloughed, while essential employee...