Mami Konneh Lahun
Mami Konneh Lahun has not been seen since finishing the London MarathonMet Police

A woman who came 20th at the 2014 London Marathon has gone missing hours after crossing the finishing line.

Mami Konneh Lahun, 24, from Sierra Leone, arrived in the UK on 7 April to take part in the 26.2 mile race. She was due to fly home on 14 April but did not return to her temporary accommodation in Greenwich.

Police say she has no links to the UK and does not own a mobile phone.

Konneh Lahun is reportedly Sierra Leone's fastest-ever female 5,000m and 10,000m runner. Last year, she won the Sierra Leone and Liberia marathons.

Police are now appealing for information regarding the whereabouts of the elite athlete.

Elsewhere, a 42-year-old man collapsed and died after finishing the marathon. He was given medical attention at the end of the race, but was pronounced dead when taken to hospital.

A statement from the event organisers said: "It is with regret that we have learnt of the death of a competitor in the Virgin Money London Marathon.

"The organisers of the Virgin Money London Marathon would like to express their sincere condolences to the family and friends of the deceased."