Mystery over Ukraine blast
![Mystery over Ukraine blast](https://mf.b37mrtl.ru/files/oldfiles/news/mystery-over-ukraine-blast/480cef9ca853d.si.jpg)
An investigation has begun after a blast in the centre of the Ukrainian capital, Kiev, left a 20-year old woman injured.
No-one was killed and according to the Interfax-Ukraine news agency the injured woman refused hospital treatment.
Police are now investigating the cause of the blast.
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