Footage of the aftermath of a high-rise tower block collapsing suddenly following a failed demolition. <br /><br />Two, vacant 15-storey buildings in Seaforth, Merseyside, UK were due to be taken down with explosives on Sunday morning, but both remained standing after the detonation. <br /><br />Churchill House later collapsed and this video shows the immediate aftermath, with debris and smog filling the air.
