UN failing to guage dangers of terror, risks losing relevance: PM

He also slammed those talking about 'good terrorism' and 'bad terrorism', saying they are "knowingly or unknowingly" lending a "force" to the menace which is a threat not only to any country or region but the entire humanity.

At the same time, Modi said terrorism needs to be delinked from religion and underlined that the menace cannot be eradicated only by using "bombs, guns and pistols" but by creating an environment wherein the youth are saved from being radicalised.

"Last week, a terrible terror attack took place in Brussels. I extend condolences to those who lost their dear ones. It is after a long time that such a serious incident has happened on this soil," he said addressing a gathering of Indian diaspora here.

He said while India has been suffering from terrorism over the last 40 years, the world has realised now how "deadly" and "cruel" terrorism is.

Modi noted that in the last year, 90 countries suffered terror attacks in which thousands of people lost their lives and took on the United Nations for still not defining terrorism.

"..if you ask about terrorism, the UN does not know what terrorism is and how to deal with it. Because it (UN) was born from the dreadfulness of wars and therefore they are unable to think beyond that.

"This (terrorism) is a challenge of the new age, a challenge to the humanity and in gauging it, the world's such a major institution is not able to fulfill its duty," the Prime Minister said.

He pointed out that India has been pleading with the UN for years that terrorism should be defined -- who is a terrorist, which is a terrorist country, who is helping terrorists, who is supporting terrorists and which are the things that encourage terrorism.

"Once it is put out in black and white, then people will starting getting scared of associating with it and will try to dissociate.

"I don't know when the UN will do so and how it will do so but given the emerging situation, if solutions are not found to this (problem), then it does not take time for an institution to become irrelevant.

"If you have to move with the times, understand challenges and ensure a peaceful life in the 21st century, then the world leadership will have to take up the responsibility. The more the delay, the more the loss," he warned.