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Investigations are under way at a hospital in Madrid after a Spanish nurse became the first person known to have contracted the deadly Ebola virus outside west Africa, the BBC reported.

The nurse had treated two Spanish missionaries who died of the disease after being flown home from the region.

Meanwhile, US President Barack Obama has announced plans to screen passengers flying to the United States.

Some 3,400 people have died in the outbreak - mostly in West Africa.

Barack Obama criticised foreign governments for not acting "as aggressively as they need to" against the outbreak.

"Countries that think that they can sit on the sidelines and just let the United States do it, that will result in a less effective response, a less speedy response, and that means that people die.

"And it also means that the potential spread of the disease beyond these areas in West Africa becomes more imminent," Mr Obama said.

The 40-year-old nurse was part of the Madrid team that treated Spanish priests Manuel Garcia Viejo and Miguel Pajares, who both died of the virus, Spanish officials say.

The nurse is in a stable condition and has been moved from the Alcorcon hospital to a specialised unit at the Carlos III hospital.