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Ukraine says intercepted communications prove Russian-backed rebels attacked city, killed 30

  • A man walks past an apartment building damaged by a Grad missile in Vostochniy district of Mariupol, Eastern Ukraine, Sunday, Jan. 25, 2015. Indiscriminate rocket fire slammed into a market, schools, homes and shops Saturday in Ukraine's southeastern city of Mariupol, killing at least 30 people, authorities said. The Ukrainian president called the blitz a terrorist attack and NATO and the U.S. demanded that Russia stop supporting the rebels. (AP Photo/Evgeniy Maloletka)

    A man walks past an apartment building damaged by a Grad missile in Vostochniy district of Mariupol, Eastern Ukraine, Sunday, Jan. 25, 2015. Indiscriminate rocket fire slammed into a market, schools, homes and shops Saturday in Ukraine's southeastern city of Mariupol, killing at least 30 people, authorities said. The Ukrainian president called the blitz a terrorist attack and NATO and the U.S. demanded that Russia stop supporting the rebels. (AP Photo/Evgeniy Maloletka)  (The Associated Press)

  • A piece of an exploded Grad missile is photographed outside an apartment building in Vostochniy, district of Mariupol, Eastern Ukraine, Sunday, Jan. 25, 2015. Indiscriminate rocket fire slammed into a market, schools, homes and shops Saturday in Ukraine's southeastern city of Mariupol, killing at least 30 people, authorities said. The Ukrainian president called the blitz a terrorist attack and NATO and the U.S. demanded that Russia stop supporting the rebels. (AP Photo/Evgeniy Maloletka)

    A piece of an exploded Grad missile is photographed outside an apartment building in Vostochniy, district of Mariupol, Eastern Ukraine, Sunday, Jan. 25, 2015. Indiscriminate rocket fire slammed into a market, schools, homes and shops Saturday in Ukraine's southeastern city of Mariupol, killing at least 30 people, authorities said. The Ukrainian president called the blitz a terrorist attack and NATO and the U.S. demanded that Russia stop supporting the rebels. (AP Photo/Evgeniy Maloletka)  (The Associated Press)

  • Rescue workers try to pull out a piece of an exploded Grad missile outside an apartment building in Vostochniy district of Mariupol, Eastern Ukraine, Sunday, Jan. 25, 2015. Indiscriminate rocket fire slammed into a market, schools, homes and shops Saturday in Ukraine's southeastern city of Mariupol, killing at least 30 people, authorities said. The Ukrainian president called the blitz a terrorist attack and NATO and the U.S. demanded that Russia stop supporting the rebels. (AP Photo/Evgeniy Maloletka)

    Rescue workers try to pull out a piece of an exploded Grad missile outside an apartment building in Vostochniy district of Mariupol, Eastern Ukraine, Sunday, Jan. 25, 2015. Indiscriminate rocket fire slammed into a market, schools, homes and shops Saturday in Ukraine's southeastern city of Mariupol, killing at least 30 people, authorities said. The Ukrainian president called the blitz a terrorist attack and NATO and the U.S. demanded that Russia stop supporting the rebels. (AP Photo/Evgeniy Maloletka)  (The Associated Press)

Ukraine's leader says intercepted radio and telephone conversations prove that Russian-backed separatists were responsible for firing the rockets that pounded the southeastern city of Mariupol and killed at least 30 people.

President Petro Poroshenko, who held an emergency meeting Sunday of his Security Council, said the intercepted calls offered irrefutable evidence that separatists committed the attack.

Separatist leader Alexander Zakharchenko initially announced that his forces were launching an offensive on Mariupol. But after the extent of civilian casualties became known, he backtracked and blamed Ukrainian forces for Saturday's carnage.

In Mariupol on Sunday, emergency workers recovered fragments of rockets from the scene of the killings. Representatives of the United Nations refugee agency handed out blankets to people left homeless or without heat because of the attack.