Pemba, Mozambique: A second disaster unfolded on Sunday in northern Mozambique in the wake of Cyclone Kenneth as raging flood waters killed one person and began to cut off the region's main city from the outside world. Some 160,000 people were at risk, with more torrential rain forecast for the days ahead.

"Help us, we are losing everything!" residents in Pemba city shouted at passing cars as the rushing waters poured into doorways. Women and girls with buckets and pots tried to scoop away the torrent, in vain. Some houses collapsed, the United Nations said.

A woman tries to create a drainage system outside her shop in Pemba, Mozambique on Sunday. Credit:AP

"It's an awful sense of deja vu," said Nicholas Finney, response team leader with the aid group Save the Children. Kenneth arrived just six weeks after Cyclone Idai ripped into central Mozambique and killed more than 600 people with flooding.

This was the first time in recorded history that the southern African nation has been hit by two cyclones in one season, again raising concerns about climate change.