Hamas has recently arrested dozens of Salafists, who criticise the terror group for not following Shariah law and allowing a peace truce with Israel

ISIS fanatics are thought to have carried out five co-ordinated car-bomb attacks in Gaza today, targeting members of Hamas and Islamic Jihad.

The devastating blasts rocked a quiet area in the north of Gaza city, destroying five cars thought to belong to members of the Ezzedine al-Qassam and Al-Quds brigades.

The attacks come amid growing tensions between the Palestinian territory's rulers and extremist opponents. Several people reportedly suffered minor injuries in the attacks.

Devastating: The bomb attacks tore through several vehicles in the north of Gaza city

Sunset in Gaza: The co-ordinated blasts appear to be a warning from suspected ISIS supporters

Today's attacks are believed to be the work of hardline ISIS supporters, looking to destabilise Hamas' control of the strip.

Some accounts claim that several crudely drawn ISIS style flags of tawheed were painted on a nearby wall shortly before the attack. It is unclear if ISIS will claim responsibility for the attack.

Witnesses said that the five blasts went off in the space of 15 mins, at around 6:30am. It is thought the devices had been placed underneath the cars parked in front of their owners' homes.

Three of the cars were said to have belonged to members of Al-Qassam and two to members of Al-Quds, the armed branches of Hamas and Islamic Jihad.

Al-Qassam and Al-Quds released a joint statement on Sunday saying 'the culprits of the violence are in the camp of traitors' without providing further details.

'Guilty hands are attempting to attack the resistance by blowing up its fighters' vehicles, which only serves the occupier and its objectives,' the statement said. Occupier refers to Israel.

A spate of attacks has targeted public buildings, officials, international organisations and others seen as linked to the establishment in Gaza.

In May, mortar rounds were fired at a base for Al-Qassam in an incident claimed by a group calling itself Supporters of the Islamic State in Jerusalem, which has also taken credit for recent rocket fire into Israel.

Hamas recently launched a crackdown on Salafists, with as many as 100 members or supporters being arrested and jailed.

Salafist sympathisers have questioned Hamas' style of governance, accusing the terror group of not enforcing Islamic law and slamming the militants for allowing a truce with Israel since last summer.

Witnesses in Gaza said the explosions went off around 6:30 am and appeared to have been caused by bombs placed underneath the cars parked in front of their owners' homes

According to witnesses, the five explosions in Gaza City occurred within an interval of 15 minutes and three of the cars were said to have belonged to members of Al-Qassam and two to members of Al-Quds

Police working under Hamas, the Islamist movement that rules the Gaza Strip, did not say who they believed was responsible, but vowed action against the culprits.

'This morning, saboteurs exploded several cars of (members of) resistance movements in the Sheikh Radwan neighbourhood, causing material damage,' Hamas police said in a statement.

'Security forces have opened an investigation and are searching for those responsible. We assure that the criminals will not escape punishment.'

The explosions appeared to be intended as a warning rather than an attempt to inflict casualties given the early hour, as has occurred with previous incidents.

A series of such attacks in recent months is suspected to have been carried out by Salafist extremists, some of whom claim links with Islamic State group jihadists.

There have been growing signs of internal unrest in the Gaza Strip, with Hamas engaged in a power struggle with smaller extremist groups in the coastal enclave of 1.8 million people ravaged by three wars with Israel in six years.

Earlier this month, ISIS released a 15 minute propaganda video, designed to increase Palestinian support for ISIS. Featuring half a dozen Palestinian jihadis in Syria, the fighters urge their countrymen to pledge allegiance to ISIS and wage jihad in their homeland.

Timing: The surprise car bomb attacks come not long after ISIS released a propaganda video, featuring Palestinian ISIS jihadis urging Palestinians in Gaza and the West Bank to pledge allegiance to ISIS

Revealed: The video features one Palestinian jihadi (centre) who was reportedly wanted by Hamas for collaborating with Israeli security services

Fanatic: Each fighter takes a couple of minutes to rant about the need for Palestinians to join ISIS

It is unclear when the video was filmed but according to ISIS, all the fighters were in Aleppo province, Syria

Salafists have recently complained that Hamas has not been implementing Shari'a law in Gaza

Calling himself Abu Ayesha, the Palestinin jihadi threatened to turn Gaza into a 'river of blood'