“Fresh attacks in Tana River have resulted in the death of 11 people, and left 10 injured and hospitalised,” Kenya Red Cross official Nelly Muluka told AFP, adding the attack happened in the early hours of Friday morning.
“There is a lot of tension in the area following the attack,” she added. “These are revenge attacks.”
Following the killings last month — in which at least 52 mainly women and children were hacked or burnt to death in the worst ethnic massacre for several years — police brokered meetings between the two rival communities.
However, tensions have remained high, and one person was killed in the area last week.
The two communities — the Pokomo and then Orma — have clashed before over the use of land and water resources.
The Pokomo are a largely settled farming people, planting crops along the Tana River, while the Orma are mainly cattle-herding pastoralists.
The attack happened in the Reketa area of Tarassa in Kenya‘s southeast, close to the coast and some 300 kilometres (185 miles) from the capital Nairobi.
In 2001, at least 130 people were killed in a string of clashes in the same district and between the same two communities about access to land and a river.
Regional police chief Aggrey Adoli said teams had been sent to the area.