Syrian authorities arrest three men with suspected links to Tadamon massacre

Imad Mohammed al-Mahmoud (centre, left), and Somer Mohammed al-Mahmoud (right) are alleged to have belonged to Syria’s military security before the fall of Bashar al-Assad. They were arrested by Syrian security forces in Tadamon, a suburb of Damascus, on Monday. Photograph: Omar Albam/AP

Authorities in Damascus have arrested three men they claim were involved in a notorious massacre of civilians by Syrian security forces revealed by the Guardian three years ago.

Footage posted online purported to show one of the men, Monzer al-Jazairi, with his hands bound and being led through the heavily damaged streets of Tadamon, the Damascus suburb where nearly 300 people were killed in an atrocity filmed by the perpetrators themselves and then leaked by a whistleblower to activists in Europe.