Israel is detaining doctors "en masse" in the Gaza Strip, the founder of the Gaza Medic Voices organization, Omar Abdel-Mannan, said on Sunday.

"It's just extremely distressing as a doctor to see that my colleagues are being detained en masse," Abdel-Mannan told Sky News.

A large number of starving, dehydrated people are arriving at hospitals in the Gaza Strip, he said, adding that the enclave could face outbreaks of diseases, including cholera and diarrhea.