The US has accused the Rwandan army and M23 rebel group of being responsible for the deadly bombing at a displacement camp in the Democratic Republic of Congo.

On Friday, a strike on the Mugunga camp in Goma killed at least nine people, including seven children.

The Congolese army and M23 blamed each other for the attack.

Rwanda, which borders DR Congo, is widely accused of backing the rebel group and called the US accusation “ridiculous”.

Rwandan government spokesperson Yolande Makalo said the Rwanda Defence Force (RDF) was a professional army that would never attack a camp for Internally Displaced People (IDP).

The US State Department said Friday’s attack came from positions held by the RDF and the M23 group.

A spokesperson said the US was “gravely concerned about the recent RDF and M23 expansion” in eastern DR Congo and called on both parties to “respect human rights and adhere to applicable obligations under international humanitarian law”.

“It is essential that all states respect each other’s sovereignty and territorial integrity and hold accountable all actors for human rights abuses in the conflict in eastern DR Congo,” they added.

Images circulating on social media showed bodies lying on the ground at the camp on Friday.

Most residents had fled there to escape fighting in their home towns and villages.

Lt Col Guillaume Njike Kaiko, a spokesman for DR Congo’s army in the region, said the strike had come in retaliation for earlier Congolese attacks on Rwandan army positions.

President Félix Tshisekedi, who has spent several weeks abroad, will be returning to the central African country this weekend following the attack.

Rebel and government troops have both been accused in recent months of abuses against civilians as they vie for territorial control.

The latest attack occurred shortly after M23 rebels announced that they had taken control of the area around Rubaya, which is rich in coltan – a mineral used to make mobile phones and EV batteries.

Meanwhile, a military court in Goma has sentenced eight DR Congo soldiers to death for “desertion” and “cowardice” when fighting rebel forces.

M23, formed as an offshoot of another rebel group, began operating in 2012 ostensibly to protect the ethnic Tutsi population in the east of DR Congo, which had long complained of persecution and discrimination.

UN experts have said that the group is backed by neighbouring Rwanda, which is also led by Tutsis, something that Kigali has consistently denied.