
US and Qatar officials decide to prevent Iran from using a $6 billion humanitarian aid fund.
The money had been unfrozen in a US-Iran prisoner swap deal after five US detainees were released.
The decision to halt access to the funds is prompted by concerns over Iran's support for Hamas.
A surprise attack by Hamas on Israel intensifies scrutiny of Iran's involvement.
Hamas gunmen killed 1,200 people in Israel and took 150 hostages during their assault.
Israel responded with air and artillery strikes on Hamas targets in Gaza, resulting in over 1,350 deaths.
US Secretary of State Antony Blinken states they have strict oversight of the funds and can freeze them.