Media reports said Hamdallah was unhurt, but several bystanders were injured.
Hamdallah was reportedly visiting Gaza, along with Palestinian intelligence chief Majid Faraj, to open a water treatment plant that the Palestinian Authority helped finance. He said in the address that three cars were damaged.
Hamas called the attack an "ugly crime" and said it had launched an investigation.
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Gaza's Hamas-run interior ministry said the explosion hit as the prime minister's convoy passed near the northern town of Beit Hanoun.
Top official of the left wing Popular Front for the Liberation of Palestine Kayed Al-ghoul told Xinhua that the White House "is aiming at reestablishing the US role in managing the Palestinian-Israeli conflict by its various dimensions", and added that "Washington wants to use the conference as a blackmail tool against the Palestinian Authority and Hamas to make the Palestinians accept the liquidation project of the century deal".
Mr Hamdallah's ruling Fatah party quickly held Hamas responsible for the "cowardly attack" on the convoy, further escalating tensions between the bitter rival factions.
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Gaza, part of the territory claimed by Palestine, has been ruled by Hamas since 2007.
U.S. President Donald Trump's senior adviser Jared Kushner, U.S. special envoy Jason Greenblatt and officials from the National Security Council will present proposals for improving the humanitarian situation in Gaza at a White House "brainstorming session" on Tuesday, a senior White House official said, according to Axios.
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Suh is set to meet Japanese Prime Minister Shinzo Abe and Chief Cabinet Secretary Yoshihide Suga on Tuesday, the spokesman added. Yang repeated China's position that it wants denuclearization on the Korean Peninsula and problems to be solved through talks.