Hamas's spokesperson condemned the bomb attack and rejected the accusations from the PA that it had carried out the attack.
The explosion happened after Hamdallah's convoy entered northern Gaza through the Erez checkpoint on the border with Israel. He was on his way to a sewage treatment station in Gaza that is funded by the PA.
Abbas spokesman Nabil Abu Rudeineh said the attack on the consensus government was an attack on the unity of the Palestinian people, according to Palestinian news agency WAFA.
Fawzi Barhoum, Hamas spokesperson, said "Hamas condemns the crime of attacking the convoy of Dr Rami Al-Hamdallah."
"Hamas considers this crime as part and parcel of trying to destabilise the security in Gaza Strip and attacking the reconciliation and solidarity. The hands behind this crime are the same hands that killed Mazen Fuqaha, and tried to kill General Tawfiq Abu Naim."
Mazen Fuqaha was a commander of Hamas' military wing, and was killed last year in Gaza. Tawfiq Abu Naim, commander of Hamas's internal security forces in Gaza, survived an assassination attempt in October, after his car was blown up in the Nuseirat refugee camp in the middle of Gaza City. Hamas holds Israel responsible for both incidents.
Barhoum added that Hamas dislikes "the ready-made accusations" made by the PA officials in Ramallah against it, and asked the PA to open an investigation into the incident.