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Those demonstrations also coincided with a military parade in Washington DC to mark 250 years of the US army, which was held on the president's 79th birthday.

Such an apparent lack of transparency for a humanitarian group is a "critical" issue, says Bill Deere, Washington DC office director for the UN's Palestinian refugee agency UNRWA.

We return to Washington DC after our searches in Delaware.

Washington DC and Tehran were due to resume talks on Iran's nuclear programme on Sunday, but the talks have now been cancelled, mediator Oman said.

Walz shared the anecdote and warning Friday during an hour-long conversation at the Center of American Progress in Washington, DC, moderated by CAP President Neera Tanden.