New Delhi, Sep 11 (IANS): If Swami Vivekananda's message of universal brotherhood been followed by the world, history would not have witnessed "dastardly acts" like 9/11 in the US, said Prime Minister Narendra Modi Thursday.

"Had we followed Swami ji's message, history would never have witnessed such dastardly acts as we saw on 11th September 2001 in USA. Let us remember the words of Swami Vivekananda and dedicate ourselves to furthering the cause of unity, brotherhood and world peace," Modi said in a tweet.

On Sep 11, 2001, the US had witnessed its worst terror attack when two hijacked aircraft crashed into the north and south towers of World Trade Center in New York City of America, killing thousands of people.

Also on this day in 1893, Swami Vivekananda had created history by his soul-stirring address at World Parliament of Religions in Chicago.

"There are two images of 11th September - one of the trail of destruction in 2001 and the other - the message of Swami Vivekananda in 1893. Through his address, Swami Vivekananda drew the entire world's attention to our nation's rich history and strong cultural roots.

"Sisters and brothers of America with these words of Swami Vivekananda, India's message of universal brotherhood reverberated across the world," he added.