Sri Lanka blasts a challenge to all nations

Editor's Note: The eight explosions in Sri Lanka on Easter Sunday have claimed more than 300 lives and left over 500 people injured. A ninth explosion was reported on Monday near a church in Colombo, but none was reported killed or injured. The Islamic State reportedly claimed responsibility for the bombings on Tuesday. Two experts share their views on the attacks with China Daily's Liu Jianna. Excerpts follow:

Joint efforts needed to combat terrorism

Ruwan Wijewardene, Sri Lankan state defense minister, said on Tuesday that Islamic extremists staged the attacks in Sri Lanka in retaliation to the shootings in two New Zealand mosques in March that claimed 50 lives.