The number of people in Zimbabwe affected by a devastating cyclone and flooding has jumped to 200,000, with most of the damage occurring near the Mozambique border, the UN said on Thursday.

The initial estimate of those hit in Zimbabwe was 15,000 but World Food Programme (WFP) spokesman Herve Verhoosel told reporters in Geneva that the numbers had surged following an overnight assessment.

The situation in Zimbabwe’s eastern district of Chimanimani on the Mozambique border “is very bad,” Verhoosel said. “Some 90% of the district has been significantly damaged,” he added.

Five days after tropical cyclone Idai cut a swathe through Mozambique, Zimbabwe and Malawi, the full extent of the devastation is not yet clear.