Refugee families in Syrian camps are begging for donations on TikTok while the company takes up to 70% of the proceeds, a BBC investigation found.

Children are livestreaming on the social media app for hours, pleading for digital gifts with a cash value.

The BBC saw streams earning up to $1,000 (£900) an hour, but found refugees received only a tiny fraction of that.

TikTok said it would take prompt action against "exploitative begging".

The company said this type of content was not allowed on its platform, and it said its commission from digital gifts was significantly less than 70%. But it declined to confirm the exact amount.

Earlier this year, TikTok users saw their feeds fill with livestreams of refugee families in Syrian camps, drawing support from some viewers and concerns about scams from others.

In the camps in north-west Syria, the BBC found that the trend was being facilitated by so-called "TikTok middlemen", who provided families with the phones and equipment to go live.

The middlemen said they worked with agencies affiliated to TikTok in China and the Middle East, who gave the families access to TikTok accounts. These agencies are part of TikTok's global strategy to recruit livestreamers and encourage users to spend more time on the app.

Since the TikTok algorithm suggests content based on the geographic origin of a user's phone number, the middlemen said they prefer to use British SIM cards. They say people from the UK are the most generous gifters.

Mona Ali Al-Karim and her six daughters are among the families who go live on TikTok every day, sitting on the floor of their tent for hours, repeating the few English phrases they know: "Please like, please share, please gift."

Mona's husband was killed in an airstrike and she is using the livestreams to raise money for an operation for her daughter Sharifa, who is blind.

The gifts they're asking for are virtual, but they cost the viewers real money and can be withdrawn from the app as cash. Livestream viewers send the gifts - ranging from digital roses, costing a few cents, to virtual lions costing around $500 - to reward or tip creators for content.