LONDON - British Prime Minister David Cameron on Saturday reiterated his resolve to hunt down the killers of British aid worker Alan Henning and bring them to justice.

Cameron on Saturday met with senior security, intelligence and police officials in his government to discuss the murder of Alan Henning and the British government's response.

A footage released on late Friday showed the murder of Henning.

The 47-year-old aid convoy volunteer was a Manchester taxi driver who traveled to Syria to help deliver food and clothing to stricken civilians in the war-torn country.

"The PM was clear that we must keep doing all we can to ensure that these terrorists are found and brought to justice for their heinous crimes and we will keep working with our US partners and those in the region to do this," a Downing Street spokesperson said in a statement following the meeting.

The Downing Street spokesperson said the brutality of the ISIL, also known as the Islamic State (IS), "will not persuade us to change our approach."

"Indeed, the senseless murder of an innocent man only reinforces our resolve to defeat this terrorist organization and to eradicate the threat they pose to Britons - whether those in the region or here on the streets of the UK," the statement added.

At the meeting, Cameron also discussed a second video released on Friday night which showed an apparent British ISIL fighter unmasked delivering a further message.

"The police are urgently investigating the contents of the video, including possible terrorism offences relating to it," the spokesperson noted.

The IS has previously released videos showing the apparent beheadings of two US journalists, James Foley and Steven Sotloff, as well as British aid worker David Haines.

In the latest footage, similar to the previous ones, Peter Kassig, a US aid worker, was paraded at the end of video.

British PM vows to hunt down Islamic State killers	Britain to join airstrikes against Islamic State in Iraq