The community of Perth paid tribute to David Haines - the latest victim of the Islamic State (IS) terror group - at a service held in his former school today.

The Rev Jim Stewart spoke to pupils at Perth Academy and described David as a a man of care and compassion.

The school chaplain added: "David was making a difference to people by bringing them hope and help at their most vulnerable time. He truly was an inspiration to his family and to those whom he helped and as David Cameron the Prime Minister said, 'David was a true British hero.' 

"The shock felt by our friends in the local Muslim community over this atrocity is very real. The people of Perth are generous and will stand with the Muslim community who are just as horrified as we are over these actions.

"Perth Academy stands together with the Haines family at this distressing time. Our love, thoughts and prayers go to them."

Meanwhile, the brother of David Haines has said the extremists pose a threat to "every nation, every religion and every person".

Mike Haines warned that radicalisation presents a threat "to the wholesale safety of every person in the world", but said the Muslim faith was not to blame.

Speaking after a video emerged showing his brother, originally from Perth, being beheaded by a militant, he said: "Our brother, son, father, nephew, husband and friend was brutally and cold-bloodedly murdered by ISIL. We agree with the Government in that ISIL are extremely dangerous, and pose a threat to every nation, every religion, every politics and every person.

"Radicalisation remains the biggest threat to the safety of every person in the world. Increasingly we are seeing more and more radicalisation in every walk of life. It is not a race, religion or political issue, it is a human issue and it is in our everyday lives.

Mr Haines added that neither the Muslim faith nor people of Middle Eastern descent were to blame. Quoting from the Koran, he said: "Since good and evil cannot be equal. Repel the evil with something that is better."

He went on: "The attraction of the use of terror as an implement of operational control has a widespread appeal to many disenfranchised throughout society, as you can see by the amount of foreign nationals, not just British, fighting for ISIL. We need to look at how we deal with this problem."

He stressed his family's support for the Government's aim to prosecute IS fighters from the UK on their return home. Mr Haines' warnings came after he paid tribute to his brother's "enthusiasm" for the humanitarian work he did.

He said David, 44, who leaves behind a wife and two children, was "most alive" when helping others, adding that - for the family - this was the "most important element of this whole sad affair".

The Haines family has faced an agonising wait to learn his fate after his kidnappers released a video making threats on his life earlier this month.

Mr Haines said: "David was like so very many of us, just another bloke. Born in 1970 to parents who loved us both, our childhood was centred around our family.

"David was a good brother, there when I needed him and absent when I didn't. I hope that he felt the same way about me.

"He was, in the right mood, the life and soul of the party and on other times the most stubborn irritating pain in the ass. He would probably say the same about me."

Mr Haines told how his brother began working with the Royal Mail on completing his studies at Perth Academy, before joining the RAF as an aircraft engineer. During this time, he married and had a daughter, Bethany, in Scotland with his first wife.

Mr Haines went on to describe the work he did. The statement said: "David served with the UN in the Balkans, helping people in real need. There are many accolades from people that David helped.

"David began to decide ­humanitarian work was the field he wanted to work in. David was most alive and enthusiastic in his humanitarian roles. His joy and anticipation for the work he went to do in Syria is for myself and family the most important element of this whole sad affair." David married his second wife, Dragana Prodanovic Haines, in 2010, shortly after the birth of their daughter Athea. They lived in Sisak, a town south of Zagreb in Croatia.

Reacting to the news of Mr Haines' murder, Perth MP Pete Wishart said: "This dreadful news will be devastating for Mr Haines' family and I know that everyone in Perthshire will share my shock, anger and sadness." ACTED, the aid agency he was working for in Syria said the organisation was "deeply appalled and horrified".