An engine fire would need a constant supply of fuel to reach the temperature needed to damage nearby vehicles so extensively. There isn't enough combustible material inside an engine compartment to create such damage. An external fuel source must have been added.

This is very suspicious on its own... but when you also consider the fact that the president and his security team DO NOT travel in unarmoured civilian rental vehicles, it certainly raises eyebrows.

An engine fire would need a constant supply of fuel to reach the temperature needed to damage nearby vehicles so extensively. There isn't enough combustible material inside an engine compartment to create such damage. An external fuel source must have been added.