* Israeli strikes kill 26 people after two soldiers killed * Trump says ceasefire still in place, Hamas leadership maybe not involved * Says violations will be handled 'toughly but properly' * Gazans report explosions, gunfire, airstrikes and tank shelling * Dispute over return of hostages' bodies continues between Israel and Hamas (Adds Trump comments paragraphs 2-4, 7-9) By Alexander Cornwell, Nidal al-Mughrabi and Jeff Mason JERUSALEM/CAIRO/ABOARD AIR FORCE ONE, Oct 19 (Reuters) – T he Israeli military said on Sunday a ceasefire in Gaza had resumed after an attack killed two of its soldiers and prompted a wave of airstrikes that Palestinians said killed 26 people, in the most serious test yet of this month's U.S.-brokered truce. U.S. President Donald Trump said the ceasefire he brokered

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