Ms Damari and her mother Mandy asked the prime minister to put pressure on Hamas and UNRWA to allow the Red Cross access to the remaining 82 hostages being held in the territory.
In a phone call with prime minister Sir Keir Starmer, Emily Damari, 28 - who was released earlier this month - told him she was previously held at a site belonging to the UN’s agency, the UNRWA.
Mandy Damari wrote on X after the phone call: "Hamas held Emily in UNRWA facilities and denied her access to medical treatment after shooting her twice.
Ms Touma added that UNRWA had repeatedly called for independent investigations into claims of misuse of UNRWA premises by Palestinian armed groups, including Hamas.
She added: “We’ve been calling for the release of hostages for months on end … These claims that hostages have been held in Unrwa premises, even if they were vacated, are absolutely serious.”.