At least 20 civilians were killed on Monday night in the east of the Democratic Republic of Congo in an attack attributed to the Islamic State-affiliated Ugandan rebel group, ADF, according to media reports.

As noted, the rebels attacked on the outskirts of Oicha, a town in Beni territory in North Kivu province.

A Ugandan, a UK citizen, and a South African citizen were attacked and killed by suspected ADF assailants, who also set their vehicle ablaze, in Uganda’s Queen Elizabeth National Park on October 17.

ALSO READ: Armed men kill tourists in Uganda’s Queen Elizabeth National Park

The DR Congo-based Islamist ADF militia was suspected to be behind the terrorist attack, according to the spokesperson of Uganda Police Force, Fred Enanga.

ALSO READ: Uganda sends more troops to pursue militia who killed over 40 people

In June, Uganda's President Yoweri Museveni ordered more troops to western Uganda where the ADF killed at least 37 secondary school students.

ALSO READ: ADF militia kill 24 in new attack in eastern DR Congo – reports

The Islamic State-linked ADF was also blamed for an attack on a school in Uganda’s Kasese District which killed at least 42 school children in June. The United Nations-sanctioned armed group is also linked to killings of civilians in DR Congo’s Ituri and Beni provinces, where it has been based since the 1990s.