No peace

The Organisation for Security and Co-operation in Europe (OSCE) told the BBC that fighting around Donetsk airport was spreading further into the city.

A spokesman said that their greatest concern was for civilians, especially children.

Ukrainian forces and pro-Russian rebels both say they control the airport.

It has symbolic and strategic value to both sides and has been the scene of fighting for months.

Both sides have accused the other of breaching a ceasefire agreed in Minsk last September.

"What our monitors have been reporting is a serious deterioration of the security situation in the past few days with an increase in ceasefire violations," said OSCE spokesman Michael Bociurkiw.

Ukraine conflict: Security ineast deteriorating, say observers