The UN says more than 12 million Syrians are in need of humanitarian assistance after being forced to flee their homes due to the country's civil war.

Valerie Amos, the UN's humanitarian chief, told Al Jazeera that the numbers were "going up rapidly month by month".

"Four years ago we were talking about one million people in need, now it's 12 million, the reality is much worse on the ground," she said.

Amos added that the UN was facing many challenges in delivering aid to the refugees.

The increasingly fragmented conflict raging in Syria has claimed more than 210,000 lives since erupting in March 2011.

Source: Al Jazeera