Xinhua world news summary at 0030 GMT, April 17

Saudi authorities said a soldier was killed and three others injured in a landmine blast in the border city of Jazan on Sunday morning, Saudi Press Agency reported.

A security spokesman of Ministry of Interior said the landmine explosion came when a border patrol was performing duties at Al-Daer sector in Jazan Region. (Saudi-Soldier-Explosion)

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BOGOTA -- At least 36 people were injured after a grenade went off inside a nightclub in the Colombian town of San Pedro on Sunday, local media reported. (Colombia-Grenade-Nightclub)

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ISTANBUL -- Turkish President Recep Tayyip Erdogan declared on Sunday night that the proposed constitutional changes were accepted in a referendum, paying the way for the country to introduce the presidential system.

In a televised address to the press in Istanbul, Erdogan said the amendments passed in the referendum held in the country the same day with 25 million "Yes" votes, or by leading the "No" camp by 1.3 million votes. (Turkey-Erdogan-Referendum)

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CAPE TOWN -- South African President Jacob Zuma on Sunday rejected calls for him to step down, saying his fate is to be determined by the majority.

"I will only step down once the majority says so," Zuma said at an Easter Service at the Twelve Apostles of Christ Church in Umgababa, south of Durban. He said he would not walk away unless most South Africans want him to do so. (South Africa-Zuma-Step down) Endi