Hours later, a second explosion occurred on the northern border of Gaza in the afternoon.In a statement, the IDF said the unit stationed in the area "returned fire into Gaza using tanks" in response.There were no injuries among security forces, the IDF noted. The IDF does not yet know who was behind "both cross border incidents."Prime Minister Benjamin Netanyahu made an unannounced visit to the area.The prime minister said during his visit that the past two years since the conclusion of Operation Protective Edge have been the most quiet since Hamas took over the coastal enclave in 2007. Netanyahu, who went to the site of a large terrorist tunnel from Gaza into Israel that was discovered last month, was accompanied by Defense Minister Moshe Ya’alon, IDF Chief of Staff Lt.-Gen. Gadi Eisenkot, OC Southern Command Maj.-Gen. Eyal Zamir and other top IDF officials. He received a briefing there on the security situation in the area.Speaking to Golani soldiers in a grove of Eucalyptus trees, Netanyahu compared the situation today where IDF soldiers are defending the country to the situation 70 years ago during the Holocaust when “we were like a leaf driven in the wind, with no defense force, helpless. They massacred us, slaughtered us.”Today, he said, “we have a country, an army, the ability to defend ourselves in this sector, in all sectors – near and far – and what motivates me is to secure the future of Israel in its land.”The Jewish people, he said, has no future without its country.Netanyahu praised the soldiers for their “spirit,” saying this is what makes the army what it is.Herb Keinon contributed to this report.