World News Update, what you need to know

Australians, including the man dubbed "Marathon Man", have jubilantly completed the Boston Marathon.

ELSEWHERE:

WASHINGTON - The United States is sending a Navy salvage ship to help South Korea with the recovery of the ferry that capsized last week.

KIEV - Moscow and Washington have each called for more action from the other to save a troubled deal aimed at easing the crisis between Ukraine's new Western-backed government and pro-Russian separatists in the east.

WASHINGTON - The United States says chemical attacks were likely launched in Syria this month, possibly by the regime, weeks before an announced presidential election set for June 3.

KANO, Nigeria - Nigerian soldiers and vigilantes are hunting "around the clock" for the Islamist fighters holding scores of schoolgirls hostage, an official says, as locals claimed the number kidnapped was far higher than first reported.

LONDON - Celebrity mourners joined friends and family to bid a final farewell to tragic Peaches Geldof at the British model and television presenter's funeral.