The safe protection system of the lift is generally made up of mechanical security protector and electric security protector.

电梯安全保护系统一般由机械安全保护装置和电气安全保护装置两大部分组成。

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Mexican Attorney General spokeswoman Rocio Torres denied her country's involvement with the drone Friday, but later in the day, another Mexican official said the drone was being operated by the Ministry of Public Security and was following a target at the time of the mechanical malfunction.

CNN: Drone crash in El Paso under investigation

So, amid heavy security and overseen by a team of forensic experts led by Istanbul's Chief Prosecutor Turan Colakkadi, mechanical diggers on Tuesday morning dug up Ozal's grave from a grand mausoleum in an Istanbul cemetery.

BBC: Turkey President Turgut Ozal's remains exhumed