Pope Francis spoke out against the Brussels attacks Wednesday, urging the world to unite in condemning the brutal terrorist attack.

According to Reuters, the 79-year-old pontiff said those responsible for the attacks were blinded by “cruel fundamentalism.”

“I appeal to all those of good faith to join together in unanimous condemnation of this abominable cruelty which causes only death, terror and horror,” the pope said at his weekly general audience in front of St. Peter’s Basilica.

Pope Francis' Palm Sunday message: Don't abandon refugees https://t.co/MZPikg2GCy pic.twitter.com/mKIIXulZn9

— Huffington Post (@HuffingtonPost) March 20, 2016

ISIS has claimed responsibility for Tuesday’s suicide bomb attacks on Brussels airport and a metro train in the Belgian capital on Tuesday that killed 34 people and injured at least 200 more.

The pope said he hoped God would “convert the hearts of these people who have been blinded by cruel fundamentalism.”

What did Pope Francis post as his debut on @Instagram? https://t.co/YlZutmwXDi pic.twitter.com/mpaJB9KK4L

— CBS News (@CBSNews) March 19, 2016

At the end of his weekly public audience, Pope Francis, who recently broke an Instagram record, led thousands of people in St. Peter’s Square in silent prayer for the victims.

'Pray for me:' Pope Francis joins Instagram https://t.co/30TuNRcZAF pic.twitter.com/NEO4EAdtAt

— Huffington Post (@HuffingtonPost) March 19, 2016

According to the Associated Press, Holy Week ceremonies over the next few days is drawing large crowds to the Vatican and Rome, Italy. On Friday night, Francis will preside over a Way of the Cross procession at the Colosseum. On Sunday, he will lead Easter Mass in the square and give a blessing from the central balcony of St. Peter’s Basilica, an event which in the past has drawn crowds of over 100,000.