Iraqi Prime Minister Haider al Abadi has asked the Iraqi authorities to follow up the detention of two Iraqi twin brothers who had appeared in a video of a massacre carried out by the Daesh terrorist group.

The footage showed the killing of unarmed Iraqi Air Force cadets at the Camp Speicher military base near Tikrit.

It is estimated that up to 1,700 people died in one of the worst atrocities committed in Iraq in recent times.

According to the BBC, investigators said the 23-year-olds are suspected of killing 11 people in the Iraqi city of Tikrit in June 2014.

They arrived in Finland in September, police said, and were arrested in the south-western town of Forssa.

Chief Inspector Jari Raty said that in the video the two suspects "were not masked".

"The victims were lying on the ground and they were shot one by one," he said.

Sources: MENA