At least three people died when a plane, towing a glider, collided midair with another small aircraft in Colorado, US aviation authorities said.

Yemen showed signs of friction on Monday with the United States over the fight against al Qaida, insisting it has the terror group under control, as the US Embassy in San'a ended a two-day closure.

Asia's small, open economies are caught in the crossfire of a tussle between the United States and China over whether the yuan should strengthen against the dollar to fix the lopsided global economy.

Tens of thousands of protesters fed up with government spending marched to the US Capitol on Saturday, showing their disdain for the president's health care plan with slogans such as "Obamacare makes me sick" and "I'm not your ATM."

Pressure mounted on Pakistan as the US led an unprecedented concerted effort to convince it to change its mindset and "traditional focus" on India as a threat and instead concentrate on Taliban extremists, who are just 100 kms away from Islamabad, posing an "existential threat" to the country.