An air-safety expert says that despite Iran's denials, investigators will be able to tell if a missile caused Ukraine International Airlines Flight 752 to crash

• Iran has thoroughly denied that the plane crash that killed 176 people on Wednesday was caused by one of its anti-aircraft missiles.
• However, the US, UK, and Canadian governments have said that a large body of intelligence suggests that Ukraine International Airlines Flight 752 was shot down, likely by mistake.
• Business Insider spoke with an air safety and crash investigations expert who explained that, given access to the plane's black box and debris, investigators should be able to prove definitively whether a missile hit the plane.
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Iran has denied allegations that it mistakenly shot down a Ukrainian plane outside Tehran on Wednesday, calling them a "big lie" and offering what it describes as "proof," while accusing the US, along with Canada and the UK, of carrying out a "psychological operation" to try and discredit it.

However, an air safety and accident investigations expert explained to Business Insider that when a missile strikes a plane, there are telltale signs investigators can use to make that determination.

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SEE ALSO: How the crash of Ukrainian Flight 752 unfolded, from the plunge that killed 176 people, to allegations it was shot down by an Iranian missile