News brief: Big stories of the day

President Donald Trump said on Thursday he was studying the situation in North Korea "very seriously," after Pyongyang welcomed a US envoy's visit to Seoul by firing two missiles.

A hat-trick from Pierre-Emerick Aubameyang and an Alexandre Lacazette strike booked Arsenal's place in the Europa League final with a 4-2 win at Valencia on Thursday to seal an emphatic 7-3 aggregate victory.

Top US and Chinese trade negotiators concluded the first of two days of talks on Thursday to rescue a trade deal that is close to collapsing as Washington prepares to go ahead with plans to hike tariffs on hundreds of billions of dollars of goods imported from China.

A strong 6.3-magnitude earthquake hit southern Japan Friday, the US Geological Survey said, but Japanese authorities said there was no tsunami threat.

At least eight people were killed and 15 wounded in a suicide bombing at a market in eastern Baghdad on Thursday, a security official said.