JERUSALEM (AP) — The Israeli military said it uncovered a new tunnel Thursday stretching from southern Gaza Strip into Israel and built by Palestinian militants seeking to stage attacks in Israel, a discovery that comes amid an escalation in violence between Israel and Gaza's militant Hamas rulers.
Also Thursday, Gaza militants fired several volleys of mortars at Israel, prompting Israeli retaliatory fire and airstrikes on militant targets repeatedly used by the Hamas and Islamic Jihad groups.
The fighting in recent days has been among some of the most serious violence between Gaza and Israel since a 50-day summer war in 2014.
Mousa Abu Marzouk, an official with the Islamic militant Hamas group that rules Gaza, said Egypt and Qatar have intervened to try to restore calm.
Last month, Israel discovered and destroyed another tunnel dug from Gaza into Israel. The two tunnels are the first to be found since the 2014 Gaza war, sparking concerns in Israel that Hamas is rebuilding its underground tunnel network in preparation for another conflagration. Toward the end of the 2014 war, Israel destroyed more than 30 tunnels that Hamas had dug under the border. Hamas militants had used the tunnels to infiltrate Israel and carry out attacks.
The tunnel found Thursday is about 29 meters (95 feet) underground, the army said, and it was not immediately clear whether it is a newly dug tunnel or an older tunnel Israel had hit and which had been repaired. It was discovered by soldiers on the Gaza side of the border fence in a 100-meter zone that Israeli forces still operate in and patrol.
Lt. Col. Peter Lerner, an army spokesman, said Hamas militants may have fired toward soldiers because they realized Israel was closing in on its tunnel.
"It is our job to locate them and destroy them," Lerner said, speaking about border tunnels. "Hamas is continuing to try to carry out and build this infrastructure into Israel and it's something we are not prepared to tolerate."
After Israel announced the discovery of the tunnel, more mortar rounds were fired at Israeli troops along the Gaza border fence, the military said. Israel's military responded with tank fire. About an hour later, Gaza militants fired several more mortars at the area and Israeli tanks again retaliated, the military said. Shortly afterward, Gaza residents reported Israeli jets hit open areas and observation posts used by Islamic Jihad and Hamas militants. No casualties were reported in the day's exchanges.
Also Thursday, the military said that in a joint operation with the Shin Bet security service, Israeli forces arrested a "Hamas terror operative involved in the terror organizations tunnel network."
Earlier, the military said it had hit "terrorist infrastructure sites" belonging to Hamas. The Gaza Health Ministry said three children and a 65-year-old Palestinian suffered light-to-moderate injuries in an airstrike that hit a metal workshop in Gaza City.
The workshop's owner, Hassan Hassanin, said his well-digging truck — which he described as the only one in Gaza that can reach a depth of 37 meters (121 feet) — was hit.
"Why was it bombed," he asked. "I don't pose any threat to Israel's security. Israel itself knows this machine, what it does and what its capabilities are. It doesn't pose any danger to security."
Palestinian media said an Islamic Jihad militant group outpost was also targeted.
On Wednesday, Israel struck five other Hamas targets, responding to a mortar shell launched toward Israeli forces near the Gaza Strip. The army said no soldiers were harmed.
Israel and Hamas have fought three wars since the Islamic militant group seized power in Gaza in 2007. In the 2014 summer war, more than 2,200 Palestinians, about two-thirds of them civilians, were killed. On the Israeli side, 66 soldiers and seven civilians were killed.
Israel and Hamas have largely observed a cease-fire since that war, but other militant groups also operate in Gaza. Israel says it holds Hamas responsible for any attacks out of the territory.
The latest escalation comes amid a months-long wave of violence that has seen near-daily attacks by Palestinians, mostly stabbings, which have killed 28 Israelis and two Americans. Some 193 Palestinians have been killed, most said by Israel to have been attackers and the rest killed in clashes with Israeli forces.
Associated Press writer Fares Akram in Gaza City, Gaza contributed to this report.