The flats are demolished during a controlled demolition in Medellin
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Medellin tower blocks demolished in Colombia

Engineers in the Colombian city of Medellin have blown up four tower blocks at the Space apartment complex, which were deemed unsafe following a deadly collapse.

Twelve people died last October when a concrete pillar gave way in Tower 6 at the development, causing the 24-storey building to topple.

Tower 5 was blown up in February.

Two hundred kilos (440lb) of explosives were used in the demolition, which happened on Tuesday.

Go to next video: Block collapses 'after cracks appear'