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British society must stay "vigilant" to spot signs of radicalisation in young people, Philip Hammond has said.
Talha Asmal, 17, reportedly became Britain's youngest suicide bomber when he blew himself up while fighting for Islamic State in Iraq.
Speaking about the teenager's death, the foreign secretary said: "Teachers, parents, social workers, people in the community all need to be vigilant and look for signs of early radicalisation."
Dewsbury MP Paula Sherriff has called for the community to unite after news about the teenager suicide bomber, Talha Asmal.
A man once considered the "godfather" of the British jihadi movement has said there is no doubt a 17-year-old - who has apparently become Britain's youngest suicide bomber - was groomed.
Abu Muntasir, who used to recruit extremists, told Good Morning Britain that Talha Asmal had committed an "abhorrent crime" and said parents need to have more communication with their children to prevent similar tragedies.
"There is grooming, no doubt - I know how we used to convince people by ignoring a lot of facts on the ground, ignoring reality and alternative views amongst Muslims and Muslim teaching," he said.
"So the parents need to have more communication with their children, they need to have more of an overseeing aspect of how to be a good parent.
"It's totally despicable what he (Talha) has done, it is an abhorrent crime, and we should be very careful."
The family of Talha Asmal has said the teenager, who was reportedly killed while with Islamic State in Iraq, was targeted online and was the victim of "calculated grooming".
ITV News Correspondent Neil Connery reports:
Shahid Malik, a former government minister and a family friend of the Asmals described them as "a beautiful, caring, peace-loving and incredibly humble family"
"The police have been made aware of media reports with regard to the death of a British National in Iraq.
"The identity of the person who has reportedly died has not been confirmed at this time and we are unable to comment further.
"We are aware that large numbers of British nationals are travelling to the Middle East for a variety of reasons and we understand that some of those travelling have resided in West Yorkshire.
"We continue to support families who have loved ones that are believed to have travelled and the local communities who understandably may also have concerns.
"The Foreign Office advises against all travel to Syria and some areas of Iraq. Only essential travel should be considered to other parts of Iraq. Check before making any plans."
The family of suspected ISIS suicide bomber Talha Asma, from Dewsbury, who the terror organisation has claimed was one of four men who took part in yesterday's attack on an Iraqi oil refinery killing themselves and 11 other people, have issued a statement through the Counter Terrorism Unit.
At age 17 Talha Asmal is thought be Britain's youngest suicide bomber following reports of a young Briton killed in Iraq.
Latest ITV News reports
European police agency Europol is setting up a new unit to specifically target Islamic State on social media.