Palestinian resistance movement Islamic Jihad has denied reports that its Secretary-General Ramadan Shallah was in a coma.
Media reports earlier said that Shallah, 60, was comatose after a series of operations in Lebanon, where he is based.
In a statement today, Islamic Jihad said Shallah had recently undergone heart surgery.
"His condition is stable and is subject to medical follow-up," the group said.
Citing a source close to the movement, Quds Press reported that Shallah had fallen into a coma after he underwent heart surgery in Beirut.
The agency also said that a security official at the Palestinian Embassy in Beirut had raised suspicions that the group's chief might have been poisoned, pointing the finger at Israel's Mossad or a "security apparatus or a regional state", without elaborating.
A co-founder of Islamic Jihad, Shallah was elected the group's secretary-general in 1995.
Shallah is on the FBI's list of most wanted for allegedly conspiring to carry out attacks against Israel.