neil patrick harris changing art and technology and best of all, visiting us live right here "at this hour." >>> hello i'm john berman. michaela is off today. those stories right now "at this hour." we're going to start with israel, firing up its military machine resuming air strikes in gaza against hamas. the five-hour truce to allow humanitarian aid into gaza blew up two hours after it began. hamas broke whatever peace there was with mortar fire. israeli officials say at least one rocket was shot into the country just as the break came to an end. the head of the united nations says the temporary cease-fire was, quote, mostly respected. israeli officials also say more than a dozen hamas militants tried to get into the country through a tunnel as the cease-fire began. video shows the explosion from an air strike on the spot a short time later. meanwhile, there's outrage after four children were killed in an israeli air strike as they were playing at a beach in gaza. hamas calls this a war crime. israel says it was a mistake and it's accusing hamas of using the boys as human shields. o