UN High
Commissioner for Human Rights Navi Pillay condemned the "horrendous
shooting down" of the Malaysian passenger jet in rebel-held territory
that killed all 298 people on board, and demanded a "thorough,
effective, independent and impartial investigation".
"This violation of international law, given the prevailing circumstances, may amount to a war crime," she said in a statement.
"Every
effort will be made to ensure that anyone committing serious violations
of international law including war crimes will be brought to justice,
no matter who they are," Pillay said.
The Red Cross officially
said last week that Ukraine is now in civil war -- a classification that
would make parties in the conflict liable to prosecution for war
crimes.
UN said that latest figures showed that more than 1,100
people have been killed in fighting on the ground in east Ukraine as
both government forces and rebels have increasingly used heavy weapons
in built-up areas.
"As of 26 July, at least 1,129 people have been killed and 3,442 wounded," UN statement said.
The
latest toll marks a sharp rise from that given a month ago on June 18,
when UN said at least 356 people had been killed since April.
Pillay
described reports of increasingly intense fighting in rebel bastions
Donetsk and Lugansk regions as "extremely alarming" and said both sides
were "employing heavy weaponry in built-up areas, including artillery,
tanks, rockets and missiles."
"Both sides must take great care to prevent more civilians from being killed or injured," Pillay said.
Some
100,000 people have now fled the conflict zone in the east for other
areas of Ukraine, UN said in the report released today.
The
report also accused rebels controlling swathes of territory of
conducting a brutal "reign of terror" in the areas they control,
including the abduction, torture and killing of civilians as the rule of
law has collapsed.
"These groups have taken control of Ukrainian
territory and inflicted on the populations a reign of intimidation and
terror to maintain their position of control," the report said.