GAZA (Reuters) - Israeli shelling near the southern Gaza town of Rafah killed at least 25 people on Friday, the Palestinian Interior Ministry said, as a ceasefire that went into effect only hours earlier appeared to be crumbling.

Israel accused Hamas and other Palestinian militant groups of violating the U.S.- and U.N.-mediated truce, but did not elaborate, amid Israeli media reports that gunmen had fired at Israeli soldiers in the Rafah area.

(Reporting by Nidal al-Mughrabi; Writing by Jeffrey Heller; Editing by Giles Elgood)