Ukraine's freed opposition leader Yulia Tymoshenko has spoken to Angela Merkel by telephone, according to Reuters.
The German Chancellor "congratulated Yulia Tymoshenko on her release and expressed the certainty that her return to mainstream politics would become one of the main factors in stabilising the situation in Ukraine", a statement said.
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Cooler and fresher across the UK over the next few days.
The prime minister was shouted at as she left the scene of the tragedy in which at least 79 people died.
Father-of-six Makram Ali, 51, was already receiving medical treatment as the attack unfolded. He died from multiple injuries, police say.