New Delhi, Dec. 4 -- Israel said it launched an airstrike on a Hamas militant in southern Gaza late Wednesday in retaliation for an attack earlier in the day that wounded five Israeli soldiers.

The strike was the latest test for a fragile ceasefire that has mostly held up since early October, despite claims of violations by both Israel and Hamas. Hamas put out a statement condemning the Israeli strike in Khan Younis.

Earlier Wednesday, Israel received remains of what could be one of the last hostages in Gaza and said it would begin allowing Palestinians to leave the territory through a border crossing with Egypt.

Prime Minister Benjamin Netanyahu said Hamas violated the ceasefire Wednesday when, according to the army, militants emerged...