(CNN) TV presenter Victoria Derbyshire hosted the news on the BBC with the telephone number for the UK's national domestic abuse helpline written on her hand, as the number of calls to the hotline increased by 25% amid the coronavirus outbreak.

The National Domestic Abuse hotline has seen a 25% increase in calls & online requests for help in past week



During the lockdown there's also been a daily rise in people going on the helpline website & last wk that figure was up by 150%



The helpline is open 24/7 pic.twitter.com/onHBSfhERV — Victoria Derbyshire (@vicderbyshire) April 6, 2020

There has been concern in countries across the world that lockdowns put in place to prevent the spread of the virus are leaving victims of domestic violence trapped at home with abusive partners.

Derbyshire tweeted a photo of the number written on the back of her hand early on Monday morning as she shared the news and reminded people that the helpline was open 24 hours a day.

"I'd written the number on my hand to tweet a photo of it at 7 a.m. this morning," she told CNN via email. "I left it on my skin in case it could help any of the millions watching after 9 a.m. on BBC 1."

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