Children pose as they wait with other migrants and refugees in line for a security check after crossing the Macedonian border into Serbia, on Jan. 26, 2016.

Britain will take in an unspecified number of migrant children who have been separated from their parents by conflicts in Syria and other countries, the government said Thursday.

Officials will work with U.N. refugee agency UNHCR to identify youngsters who will be eligible to take up residence in Britain, the Home Office announced.

Prime Minister David Cameron announced in September that 20,000 refugees from camps on Syria’s borders would be brought in by 2020. More than 1,000, half of them children, have so far arrived.

But Britain has opted out of European Union quotas for taking migrants and dispersing them around the 28-nation bloc.

“The crisis in Syria and events in the Middle East, north Africa and beyond has separated a large number of refugee children from their families,” Immigration Minister James Brokenshire said in a statement.

He added that while the “vast majority” of them were better off staying in the region and remaining with extended family members, “we have asked the UNHCR to identify the exceptional cases where a child’s best interests are served by resettlement to the UK and help us to bring them here.”

A Home Office spokeswoman said she could not confirm how many children would be affected by the scheme.

Pressure increased on Cameron to take more children after pictures appeared of Syrian three-year-old Aylan Kurdi, who drowned last year as his family tried to reach Greece.

Britain has committed over a billion pounds to helping refugees in Syria and the region, meaning it is the second-largest donor to efforts to ease the crisis after the U.S.

It also announced Thursday the creation of a new fund of up to £10 million (13 million euros, $14 million) to support refugee children within Europe.

Immigration is one of the most sensitive issues in British politics.

Annual net migration hit a record high of over 300,000 last year and Cameron has failed to deliver on a pledge to cut the figure to below 100,000.

The prime minister was criticized by opponents as crass on Wednesday for referring to “a bunch of migrants” at camps in Calais, northern France, during Prime Minister’s Questions at the House of Commons.

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