NAIROBI, Jan 1 (Reuters) - Police said on Tuesday they would not allow a planned mass opposition rally on Thursday in Nairobi to protest at polls that returned President Mwai Kibaki to power and triggered violence killing at least 150 people.

"When people are daring enough to commit crimes against other people's lives and property, it is not likely the police can also have the capacity to organise security properly," police spokesman Eric Kiraithe told a news conference.

"The ban on political rallies is not without reason." (Reporting by Helen Nyambura-Mwaura, Writing by Daniel Wallis)

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