Liberia was desperately searching for 17 Ebola patients Monday who fled an attack on a quarantine center in capital Monrovia, as the outbreak appeared to overwhelm authorities in west Africa's worst-hit nation.

Searches of the teeming West Point slum have so far failed to turn up any of the missing victims as neighboring Guinea said a wave of sick Liberians had begun crossing the border, which it had officially closed 10 days ago.

EU border agency Frontex said Monday it had suspended flights taking migrants back to Nigeria, one of the west African countries hit by the worst-ever Ebola outbreak.

"We have decided to indefinitely suspend those flights that we coordinate", and co-finance, to Nigeria, Frontex spokeswoman Ewa Moncure told Agence France Presse.

Liberian officials fear Ebola could soon spread through the capital's largest slum after residents raided a quarantine center for suspected patients and took items including bloody sheets and mattresses.

The violence in the West Point slum occurred late Saturday and was led by residents angry that patients were brought to the holding center from other parts of Monrovia, Tolbert Nyenswah, assistant health minister, said Sunday.

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Armed men claiming that "there's no Ebola" in Liberia raided a quarantine center for the deadly disease in Monrovia overnight, prompting at least 20 patients infected with the deadly virus to flee, a witness said Sunday.

"They broke down the door and looted the place. The patients have all gone," said Rebecca Wesseh, who witnessed the attack and whose report was confirmed by residents and the head of Health Workers Association of Liberia, George Williams.

Kenya is closing its borders to travelers from Guinea, Liberia and Sierra Leone, the three countries worst hit by the Ebola outbreak, the government said Saturday.

Kenya Airways also announced that it would suspend its flights to Freetown and Monrovia when the government travel bar on passengers comes into effect on Wednesday.

Nigeria on Saturday said it has trained 800 volunteers to fight Ebola as fears rose that the worst-ever outbreak of the deadly disease could spread across Africa's most populous nation.

Authorities in Nigeria's megacity Lagos last week appealed for volunteers to make up for a shortage of medical personnel because of a six-week doctors' strike over pay.

A woman who fell ill at an immigration facility centre in Scotland is being tested for the Ebola virus, health officials said Friday.

It is thought to be "highly unlikely" that the woman, who British media reported is from Sierra Leone, would test positive, a Lanarkshire health authority spokesman said.