Jeremy Corbyn attended a conference with a convicted Hamas military leader who was jailed in Israel for his role in orchestrating a string of terrorist attacks that killed more than 100 people, The Daily Telegraph can reveal.

The Labour leader hosted a panel discussion at a conference attended by a number of senior Hamas officials, including Husam Badran, who was given a 17-year sentence for his involvement in terrorist atrocities committed during the Second Intifada between 2001 and 2002.

He was joined at the conference by Khalid Mishaal, the former political leader of Hamas, who is on a UK sanction list, and Dr Abdul Aziz Umar, who received seven life sentences for aiding in the preparation of a suicide belt.

Badran and Umar were released by the Israeli government less than 12 months before the conference as part of a prisoner exchange for Gilad Shalit, an Israeli soldier who had been taken hostage by Hamas.

Footage uncovered by this newspaper has revealed that all three men spoke at the two-day conference in Doha, entitled the “Seminar on Palestinian Refugees in the Arab World”.