The European lawmakers flatly described the moves as critical to security on home soil, arguing that facing down terrorists has become a matter of urgency. British Prime Minister David Cameron made a passionate plea for action in drastic terms ' noting that the militants had beheaded their victims, gouged out eyes and carried out crucifixions to promote goals "from the Dark Ages."

"This is about psychopathic terrorists that are trying to kill us and we do have to realize that, whether we like it or not, they have already declared war on us," he said. "There isn't a 'walk on by' option. There isn't an option of just hoping this will go away."

Cameron told a tense House of Commons during more than six hours of debate that the hallmarks of the campaign would be "patience and persistence, not shock and awe" ' a reference to the phrase associated with the invasion of Iraq.

That unpopular intervention has cast a shadow over the discussions because critics fear that Europe will be drawn into a wider conflict, specifically taking on the Islamic group's fighters in Syria.

British lawmakers voted 524-43 for action after being urgently recalled from a recess. Belgian lawmakers also overwhelmingly approved, voting 114-2 to take part, despite widespread concerns that more terrorism may follow in their homeland as a result.

The White House said in a statement that it welcomed the countries to the coalition.

"These decisions ' along with those by Saudi Arabia, Jordan, the United Arab Emirates, Bahrain, and Qatar to participate in airstrikes against ISIL in Syria ' demonstrate the clear commitment of the international community to take action together against these terrorists," the statement reads.

In May, Belgium was shaken when a gunman opened fire at a Jewish museum in Brussels, killing four people. The suspect, French citizen Mehdi Nemouche, has been identified as a returning Islamic fighter from Syria, and leaders in Belgium and other European countries have expressed their fears that other returnees from Syria and Iraq may cause further havoc.

"We must fight against torture, against decapitations, so it's time to act," said Belgian lawmaker Veli Yuksel, a Flemish Christian Democrat

Denmark pledged seven F-16 fighter jets. Prime Minister Helle Thorning-Schmidt said her government would send four operational planes and three reserve jets along with 250 pilots and support staff for 12 months. Lawmakers in Denmark must also approve, but that is considered a formality.

"No one should be ducking in this case" she said. "Everyone should contribute."

Britain is expected to deploy Tornado GR4 aircraft, a handful of which are in Cyprus, within striking distance of northern Iraq.

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