Previous reports have stopped at saying the OSCE had lost contact with the group.
Reports of a column of military trucks with soldiers crossing the border from Russia. Previously such reports have turned out to be fake.
— Shaun Walker (@shaunwalker7) May 27, 2014
Rebels establish barricades on the airport road in #Donetsk & prepare for a fight. @CBCNews #Ukraine pic.twitter.com/JGvgAIOnjd
— J-Francois Belanger (@belangerjf) May 27, 2014
Mayor of Donetsk warns citizens to stay away from balconies and windows. Companies have released employees to go home. #Ukraine
— Alexander Marquardt (@MarquardtA) May 27, 2014
Mayor of Donetsk says 43 dead from yesterday's fighting, including 8 w/ Russian citizenship. Civilians among dead, 31 wounded. #Ukraine
— Alexander Marquardt (@MarquardtA) May 27, 2014
Grim claim that a police chief was executed in front of his men in Gorlovka today http://t.co/yttT2XDRAq anyone seen confirmation?
— Shaun Walker (@shaunwalker7) May 27, 2014
Ukrainian forces say they regained control of #Donetsk airport. But we can still hear mortar shells exploding. #Ukraine @CBCNews
— J-Francois Belanger (@belangerjf) May 27, 2014
The Organization for Security and Cooperation in Europe said in a statement today that the last time it had been in touch with the four-member team was yesterday evening, when the monitors were on a routine patrol east of the city of Donetsk.
The statement said that both the Ukrainian government and local authorities have been informed of the situation.
An OSCE spokesman told the BBC that the monitors, all men, were Turkish, Swiss, Estonian, and Danish.
There was no immediate claim of responsibility, but rebel groups have previously kidnapped OSCE monitors in Ukraine.
Some great @AP footage from yesterday's gun battle between separatists and #Ukraine military in #Donetsk http://t.co/VjkebtS3AC
— Christopher Miller (@ChristopherJM) May 27, 2014
"Now things have gone so far, it will be very difficult for things to get back to normal afterwards." http://t.co/dD06uZHkCc #Ukraine
— Thomas Grove (@tggrove) May 27, 2014