The Government is to give £3 million to charities supplying humanitarian aid to more than 100,000 people in northern Iraq, International Development Secretary Justine Greening announced.
The money will be given to Mercy Corps, Save the Children, the International Rescue Committee and Action Against Hunger to provide food, medical supplies, water and sanitation.
Ms Greening said the funding will be fast-tracked so the four charities can start using it immediately.
"British planes are dropping much-needed aid to help thousands of families stranded on the Sinjar Mountains," Ms Greening said. "DFID is stepping up its work with charities across northern Iraq where nearly 1.5 million people have fled their homes in recent months. Our support is helping hundreds of thousands of Iraqis get the food, water and sanitation they desperately need.
"The £3 million will be fast-tracked through the Department for International Development's Rapid Response Facility, which provides emergency funding for charities in the event of a humanitarian crisis."
The four charities will provide around 80,000 people with clean water, improved sanitation facilities and hygiene kits. The will also supply food, shelter and other support to over 10,000 families who have fled their homes and medical supplies and assistance to 8,000 people.
Last week the UK released £8 million of emergency humanitarian assistance for Iraq, including £3 million for the Rapid Response Facility.
The announcement was made as International Development Minister Desmond Swayne visited the Department for International Development's UK Disaster Response Operations Centre at Cotswold Airport, Kemble, Gloucestershire.
The centre houses DFID's UK-based humanitarian relief equipment and supplies, which can be deployed at very short notice to areas of disaster or humanitarian emergency.
Among the equipment dropped last night over northern Iraq were reusable water purification containers and solar lamps, which can also be used to charge mobile phones.