Palestinian officials say that a prisoner in an Israeli jail who has refused food for more 100 days is now on the longest Palestinian hunger strike ever.

Akram Rikhawi is serving a nine-year sentence for transporting suicide bombers. He seeks early release for his medical ailments, which are said to include diabetes and asthma.

Anat Litvin of Physicians for Human Rights-Israel said Sunday that Rikhawi, 39, needs to be urgently checked by a lung specialist and a neurologist.

The Israel's prison service was not immediately available for comment. It has repeatedly said Rikhawi is receiving proper care in prison.

Rikhawi started fasting on April 12, just before a mass strike of 1,200 other prisoners, who refused food to demand better conditions. They ended their protests after winning some concessions.