Shortly afterwards, he returned to Ramallah where he gave a brief address outside his office. Hamas then retreated to Gaza and set up a parallel government there.
Hamas' police force and armed wing, which the USA and the European Union consider a terrorist organization, continues to have full control of the rest of Gaza. It also cast a shadow over al White House meeting where worldwide donor nations were set to discuss the dire humanitarian situation in Gaza.
Palestinian Prime Minister Rami Hamdallah waves to the crowd upon his arrival in Gaza City on March 13, 2018. The second attack, an explosion targeting Hamas' head of security in Gaza, is widely believed to have been the work of extremists. "Wishing a speedy recovery to the injured", Greenblatt said.
No group immediately claimed responsibility for the attack.
'Meanwhile, Hamas condemns the ready accusations by the Palestinian presidency against Hamas, which calls for the security services and the ministry of interior to open an urgent and immediate investigation into the incident in order to know who is responsible for it and to bring the perpetrators to the court'.
The attack is likely to further increase tensions between Hamas - which denied any involvement - and President Mahmoud Abbas' Fateh, with a reconciliation agreement between the two all but dead.
Hamdallah was traveling to Gaza to dedicate a new water treatment plant as part of cooperation between Fatah and Hamas.
The United Nations Mideast envoy has condemned the attack on Palestinian Prime Minister Rami Hamdallah's convoy in Gaza.
The global Muslim body went on to call for an immediate investigation into the incident.More news: Chemical industry slams Trump steel tariffs
The Authority said it held Hamas responsible for the attack, stopping short of directly accusing the group of carrying out the assault, but suggesting it had failed to provide adequate security.
One of the key changes in that agreement was Hamas handing over control at Gaza's borders to the Palestinian Authority (PA) in November.
Mladenov says Tuesday's blast was carried out by people trying to undermine reconciliation and "destroy the chances for peace". Several other militant groups also operate in Gaza.
Another senior official, Tawfiq Abu Naim, said "whoever who did this only serves the [Israeli] occupation and is doing what the occupation demands".
Hamdallah, who was not hurt, left Gaza and was headed back to the West Bank.
The explosion occurred as the Palestinian prime minister made a rare visit to the Gaza Strip. One had signs of blood on the door. Hamdallah was unharmed and went on to inaugurate the long-awaited project in the northern part of the strip.
The plant has been funded by the World Bank, backed by governments within Europe and the European Union, as a lack of safe drinking water is a serious issue in the Gaza Strip.