Both sides accuse each other of violating the ceasefire in the rebel stronghold of Donetsk, where fierce fighting has been raging at the airport.
In the latest violence, rocket fire is said to have hit shops in the city, killing at least two people.
As well as civilians, a Red Cross aid worker is among this battle’s recent victims in Donetsk.
The death rate in the conflict-hit east of Ukraine has dropped sharply since the truce came into effect but there is still a heavy human toll.
Presenting the latest monthly report of the United Nations in Geneva, Gianni Magazzeni of the UN Human Rights Office said:
“The day after the ceasefire, counting from the 6th of September to the 6th of October, still 331 people were killed and 831 were wounded, which is an average of slightly over 10 people per day.”
Since April when pro-Russian separatists in Donetsk declared a ‘People’s Republic’, more than 3,660 people have been killed in eastern Ukraine according to the UN.