The group found that Iran has executed at least 73 juvenile offenders between 2005 and 2015, including at least four last year.

Both Cameron and Merkel agreed that a strong external European border and close cooperation with Turkey were vital.

"I am satisfied that there is no evidence to show that the donation was a form of gratification given corruptly," Apandi said.

The works were created in secret by 50 artists between 1939 and 1945 while they were confined to the camps or ghettos.

Capturing Sheikh Maskin would allow the army to press forward toward al-Harra hill which is the highest point in Deraa.