Turkish Prime Minister Recep Tayyip Erdogan on Thursday launched his most bitter attack yet against Israel over its air campaign in the Gaza Strip, accusing Israel of seeking a "systematic genocide" of the Palestinians.

Erdogan, a pious Muslim who sees himself as a champion of the Palestinian cause, has in the last days intensified his rhetoric against Israel as he presents himself as a leader of the entire Islamic world ahead of August 10 elections in Turkey.

The Ministry of Foreign Affairs on Thursday filed a complaint with the United Nations Security Council over “the numerous and dangerous Israeli violations of Lebanese sovereignty and of resolution 1701.”

"The Israeli daily aerial, naval, and territorial violations against Lebanon, of Lebanese sovereignty and resolution 1701 have exceeded 516 since the beginning of this year,” the Foreign Ministry said in its complaint.

Israeli prosecutors indicted three Jews on Thursday over the kidnapping and murder of a Palestinian teenager who was burned to death this month, the justice ministry said.

The identity of those charged was not disclosed by the ministry, which simply stated that one was a 29-year-old from the West Bank settlement of Adam.

After days of empty streets and shuttered shops, Gaza City sprang back to life on Thursday during a fragile U.N.-negotiated humanitarian truce between Hamas and Israel to halt cross-border fire.

The Islamist movement and Israel began observing the five-hour ceasefire at 0700 GMT, after 10 days of violence that has killed at least 230 Palestinians and one Israeli.

The sound of a blast cut through the air on Gaza's beach, drawing people out of seafront buildings to see a crowd of terrified children sprinting along the sand.

They screamed as they ran, smoke rising behind them from an Israeli strike.

Two rocket launchpads were found Wednesday evening in the al-Hinniyeh plain, south of the southern city of Tyre, state-run National News Agency reported.

“The Lebanese Army has cordoned off the area,” NNA added.

Hamas demanded changes Wednesday to an Egyptian proposal to end the deadly conflict with Israel in and around Gaza, a Palestinian official said.

Hamas's demand came as the Palestinian death toll from Israel's punishing air campaign, now in its ninth day, rose to 220 Palestinians dead after the Islamist movement snubbed the truce plan on Tuesday even though it was briefly respected by Israel.

The United States is doing "everything in our power" to end the bloodshed in the Gaza Strip, Secretary of State John Kerry said Wednesday, as he kept up contacts with regional leaders.

"Our concern is to have a legitimate ceasefire and see if we can find a way to stop the conflict and killing so we can get to the real issues that are underlying it," Kerry told reporters as he met his counterpart from Luxembourg.

Israel's acceptance of a short-lived Egyptian truce which was rejected by Hamas, has set the scene for a much broader operation in Gaza, including a limited ground incursion, analysts say.

Although the ceasefire plan unveiled by Cairo did not lead to an end to the latest round of violence, Israel's agreement to hold its fire for six hours -- even as Hamas militants continued firing rockets over the border -- won it some room for manoeuvre.

More than 200 people have been killed and 1550 others wounded in the ongoing Israeli assault on the Gaza Strip, as Hamas officials communicated to Egyptian authorities on Wednesday their rejection of the proposed truce deal.

Hamas rejected the ceasefire proposal which Egypt put forward this week, complaining it had not been a party to the discussions.