As reported here:
IDF units intercepted a Hamas commando terrorist team seeking to infiltrate Israel from the sea at Zikim beach on Tuesday, killing five.The infiltrators from Gaza were detected by Navy arena controllers. The terrorists were seen heading for the IDF's command and control post at Erez. They opened fire upon setting foot on the beach. Several IDF units engaged them, shooting and killing the terrorists. Searches are ongoing for additional terrorists.See also Daniel Greenfield's article: The Myth of Israeli Collective Punishment
One soldier was lightly injured in the exchange of fire.