Amjad Youssef is one of most-wanted fugitives in relation to slaughter of estimated 288 civilians under Assad

A Syrian former regime official suspected of leading a notorious civilian massacre revealed by the Guardian – and who became one of the country’s most-wanted fugitives after the fall of Bashar al-Assad – has been arrested by security forces, Syria’s interior ministry announced.

Amjad Youssef was captured in the Ghab plain area about 30 miles (50km) outside the city of Hama and had “been taken into custody following a carefully executed security operation”, the interior minister, Anas Khattab, said in a social media post on Friday.