A second Chinese tourist was injured in the incident Saturday night and received treatment in the local hospital in Naivasha, 91 kilometers (56 miles) miles southeast of Nairobi, the Kenya Wildlife Service said in a statement.
In the same area, a Kenyan fisherman was attacked by another hippo a few kilometers (miles) from where the incident with the Chinese occurred, a police official said.
"The man was bitten on the chest and his injuries were serious and he died minutes after he was retrieved from the lake," said Rift Valley Head of Criminal investigations Gideon Kibunja.
The deaths brought to six the number people who have been killed by hippos around Lake Naivasha so far this year.
Wildlife service spokesman Paul Udoto said the circumstances are not clear in which the two Chinese were attacked. He said attacks on tourists are rare because they are usually protected by guides.
He said hippos and lone buffalos pose the greatest danger to humans and there have been many attacks in which civilians and even rangers have lost their lives.
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