A leading Kenyan wildlife expert has said the noise from road construction is scaring lions out of Nairobi National Park and could lead to the death of people or the lions.

A lion injured a 63-old man on Friday after it strayed from the Nairobi park into a major highway during the morning rush hour. Kenya Wildlife Service rangers captured and returned it to the park. It was third incident in the last two months of lions straying from the park.

The construction of a road joining two of the city's major highways along the boundary of the Nairobi park is disorienting the lions, said wildlife expert Paula Kahumbu.