By Jennifer Rigby, Olivia Kumwenda-Mtambo and Maggie Fick LONDON (Reuters) - Health and humanitarian groups around the world were still uncertain on Wednesday if and how they could resume work after the United States issued a waiver for "life-saving" assistance in President Donald Trump's freeze on U.

Secretary of State Marco Rubio is walking back an almost-total 90-day freeze on U.S. foreign assistance, making an exception for life-saving humanitarian aid, according to a memo the Miami Herald obtained.

US Secretary of State Marco Rubio has backpedalled on the near-total freeze of US foreign aid, stating that ‘life-saving humanitarian assistance’ would be continued during the 90-day review period. There is widespread uncertainty about which programmes fall under the new waiver among global and South African health organisations.