Medical sources in Gaza say at least 198 Palestinians have been killed in Israeli air attacks launched after a Hamas offensive against Israel that killed at least 100.

Both Israeli officials and Hamas leaders have acknowledged captives have been taken to Gaza. Israeli’s military has also said captives were being held by Hamas fighters in at least two locations across Southern Israel.

Videos released by Hamas appeared to show at least three Israelis captured alive. Meanwhile, photos from the Associated Press showed at least three civilians brought into Gaza, including two women.

Israel has said an unknown number of Israeli soldiers and civilians were taken into Gaza. Israeli military spokesman Hagari said Hamas fighters were also holding hostages in the towns of Beeri and Ofakim, located about 24 kilometers from Gaza.

Hamas spokesman Abu Obeida, meanwhile, said fighters had taken “dozens” of Israeli soldiers, including officers, captive. He said the captives were being held in “safe places” and militant tunnels. Hamas deputy chief Arouri previously told Al Jazeera that the captives would be used for prisoner exchanges.