Rebels seized the airport of east Congo’s largest city Goma on Tuesday, potentially cutting off the main route for aid to reach hundreds of thousands of displaced people, after capturing the city in an offensive that left dead bodies lying in the streets.

M23 rebels claim they now control the Congolese city of Goma—an act Congo's government described as a 'declaration of war.'

Residents of eastern Congo's largest city of Goma greeted the arrival of Rwanda-backed rebels with trepidation on Monday, some staying indoors and others coming out to cheer in what one called a "show" of happiness.

M23 rebels in the Democratic Republic of Congo were reported to have taken the key eastern city of Goma in fierce fighting with government forces that sent streams of refugees fleeing area communities.

Democratic Republic of Congo's M23 rebel group has gained control of the airport in the eastern city of Goma, diplomatic and security sources told Reuters.

Congolese security forces have tried to slow the advance of Rwanda-backed m23 rebels who say they have captured Goma.

The M23 rebels are one of about 100 armed groups vying for a foothold in the mineral-rich region in the conflict, one of Africa’s largest.

A lightning advance in Congo's mineral-rich eastern borderlands is set to boost the M23 rebellion's illegal mining revenues, with analysts predicting a further surge in illicit trade in minerals including coltan and gold through neighbouring Rwanda.