Dozens of airstrikes are being directed at Gaza Tuesday.
Meanwhile, U.S. President Joe Biden got behind a cease-fire between Israel and Hamas in a telephone call with Prime Minister Benjamin Netanyahu.
Also, a new front in the conflict opened as the Israel military said it shelled Lebanon in response to six failed rocket launches from southern areas in the neighboring country.
Israel said it shot down an unmanned aerial vehicle that approached Israel's border with Jordan, without specifying where the aircraft might have originated.
Israel bombarded Gaza with airstrikes and Hamas militants fired rockets at Israeli cities despite U.S. and regional diplomacy that has so far failed to stop more than a week of deadly violence, the BBC reported Tuesday.
Israel said it struck Monday facilities belonging to the militant organization Hamas and several commanders' homes, as Prime Minister Benjamin Netanyahu vowed to continue to "strike at the targets of terrorism."
The Israeli military said more than 50 jets attacked 35 "terror targets" and destroyed more than 15 kilometers of an underground tunnel network belonging to Hamas.
The Palestinian Authority Ministry of Health in the West Bank denounced the airstrike on the tunnel system and said its local administrative office sustained heavy damage.
According to the Hamas-controlled health ministry, the overall death toll in Gaza now stands at 200, including 59 children and 35 women, with 1,305 wounded. Israel said more than 130 Hamas militants are among the dead.
"The directive is to continue to strike at terror targets and we will continue to act as necessary to restore peace and security to all residents of Israel," Reuters quoted Netanyahu as saying after a meeting with military commanders.
The armed wing of Hamas vowed to fire more rockets: "The criminal Zionist enemy intensified its bombing of homes and residential apartments...we warn the enemy that if it did not stop, we would resume rocketing Tel Aviv," Hamas representative Abu Ubaida said, according to Reuters.
The U.S. and other western nations have designated Hamas, which controls Gaza, as a foreign terrorist organization and U.S. diplomats do not work directly with Hamas representatives.
According to the United Nations, more than 38,000 people in Gaza have been internally displaced, and have sought shelter at 48 U.N. Relief and Works Agency schools across the coastal territory. The number includes at least 2,500 people whose homes have been flattened by Israeli warplanes' missiles.
"We need food, clothes, mattresses and milk," al-Arbeed, who gave birth two weeks ago, told Al Jazeera in a phone interview. She said her back hurts from "sleeping on a thin cover on the floor."
U.S. President Joe Biden expressed his support for a cease fire in the fighting, during a call with Netanyahu Monday, the White House said in a statement.
<iframe width="1280" height="720" src="https://www.youtube.com/embed/IzoE7h_6wY4" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
