KEY POINTS
  • The U.S. is ramping up efforts to cut off funding to Hamas after the group's terrorist attacks on Israel.
  • It's a difficult and complicated effort, given the scope and intricacy of the Hamas funding network.
  • Top Treasury official Brian Nelson spoke to CNBC about what the U.S. is doing.
Palestinian members of the al-Qassam Brigades, the armed wing of the Hamas movement, take part in a gathering on Jan. 31, 2016, in Gaza City to pay tribute to their fellow militants who died after a tunnel collapsed in the Gaza Strip.

The U.S. is urgently trying to cut off funding to Palestinian militant organization Hamas in the wake of its Oct. 7 terrorist attacks, which killed 1,400 Israelis and led to the capture of more than 200 people from Israel.

As part of this effort, while Israel hammers the Gaza Strip with airstrikes, the U.S. Treasury Department's under secretary for terrorism and financial intelligence met Wednesday with officials in Qatar.