John McCarthy speaks after release from captivity

The speaker, recently released after five years in captivity, expresses gratitude to the Syrian Foreign Ministry and updates on the well-being of fellow hostages. He acknowledges the strength and support received from others during his ordeal. The speaker discusses a letter from his captors, Islamic Jihad, intended for the UN Secretary-General, seeking assistance in releasing prisoners and hostages in Lebanon and Israel. He confirms that the health and living conditions of all Western hostages in Lebanon are good.

What group was responsible for holding the speaker captive?

How did the speaker describe the health and living conditions of the hostages?