Wikipedia has a stub article on the loss of the Soyuz 7K-OK No.1 test flight in 1966-12-14, but this part doesn't make sense to me:
However, once the Soyuz rocket's engines ignited, they did not operate at full power and didn't produce enough force to lift the rocket up, causing it to stay on the launch pad.
30 minutes later:
There were only thought to be three ways to trigger the LES [Launch Escape System], but there was in fact a fourth, which was triggered by disconnecting the rocket from external power and receiving a launch signal (which the system interpreted as the start of a vertical launch without any other signals by the inertial system), but the rotation of the earth causing a deviance of more than eight degrees from the initial starting orientation, which was an abort criterion.
How was the orientation measured, if not relative to the Earth's gravity, which does not change with Earth's rotation? I find no more information about this accident, which is said to have killed "all" ground staff since the unexpected LES activation put the whole rocket on fire (the Wiki list below says only one fatality).
I've only found this paper source "Siddiq (2000), p. 874."