There were no reports of further fighting after Palestinian and Israeli attacks in the early hours of Wednesday, and both sides appeared to back away from a slide toward a new war after weeks of violence along the border.
Israel responded to the cross-border attacks by targeting 65 terror sites, including rocket and munitions factories, military compounds and a terror tunnel.
He added that most of Tuesday's mortars had been intercepted by the Iron Dome missile defense battery but warned that the system was "still not hermetic".
Armed Palestinian groups are taking responsibility for the barrage of launches, which left three Israeli soldiers injured on Tuesday. There were no immediate reports of any casualties in the strip.
Israel Defence Forces (IDF) spokesman Lieutenant-Colonel Jonathan Conricus said the most extensive strikes from Gaza since the 2014 war had drawn "the largest IDF retaliatory attack" since that conflict. Israel drew worldwide condemnation for its use of deadly force against mass demonstrations by Gaza Palestinians.
"This was a dual-use tunnel, both for smuggling and terrorism", Manelis said, adding it was created to "bypass (Israel's border security) fence".
On Sunday, an Israeli tank fired on a Islamic Jihad observation post and killed three people, according to Al Jazeera.
Islamic Jihad announced an Egyptian-brokered ceasefire agreement with Israel that would come into force at midnight local time, which did not come to pass.
"The Security Council should be outraged and respond to this latest bout of violence directed at innocent Israeli civilians", USA ambassador Nikki Haley said.
Prime Minister Benjamin Netanyahu had vowed Tuesday to "respond to these attacks powerfully".More news: Irish fans react to heartbreaking Liverpool defeat in Kiev
Israel unilaterally withdrew its settlements and military presence from Gaza in 2005. Explosions shook the Palestinian enclave and smoke rose from areas hit.
PIJ released a statement saying that the mortar fire was "a blessed response of the resistance". A home was struck, but no one was wounded.
"This latest escalation was actually initiated by the Islamic Jihad and not Hamas, partly because there has been progress in reaching an understanding between Hamas and Israel", said Kobi Michael, a senior researcher at Israel's Institute for National Security Studies and former deputy director general at Israel's Ministry of Strategic Affairs.
A picture taken on May 29, 2018 shows fishing boats carrying a group of Palestinian activists who are protesting and perhaps trying to breach Israel's naval blockade on Gaza, setting to sail from Gaza City harbour.
They peaked on May 14, when at least 61 Palestinians were killed in clashes as tens of thousands of Gazans protested the USA transfer of its embassy in Israel to the disputed city of Jerusalem the same day.
Low-level demonstrations and clashes have continued ever since.
Highlighting Washington's isolation on the Israeli-Palestinian issue, Kuwait - a non-permanent Security Council member that represents Arab countries - hopes to win a high number of votes in favour of its proposal.
No Israelis have been killed.
Islamic Jihad, an Iran-backed Palestinian terror organization, attacked southern Israel Tuesday morning by lobbing between 50 and 60 mortar shells at Israeli towns and communities in what is called the "Gaza belt".