At least four explosions have rocked Gaza City, targeting cars belonging to officials from Islamic factions including the territory's Hamas rulers.

Speculation over who was behind the attacks immediately centred on supporters of the Islamic State group, who have been battling with Hamas and other Islamic groups in the small coastal strip.

Hamas recently launched a fierce crackdown on alleged IS supporters, and witnesses said a freshly painted Islamic State group flag was seen at the site of the explosions.

The charred vehicles were parked outside the houses of the local officials in the Sheikh Radwan neighbourhood.

Khader Mahmoud, a 32-year-old witness, said the blasts occurred seconds apart from each other just after 6am local time today.

Ayman Sahabani of Gaza City's Shifa hospital said the blasts slightly wounded a young woman and a man.

The Hamas-run Interior Ministry said an investigation had been launched.

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