Yes, not one or two but a good dozen to fifteen pyrotechnics went off despite Police warnings that all fans entering the ground would be searched to prevent the setting off of pyrotechnics.
Since that match there has been no suggestion at all by UEFA that they will issue proceedings against Legia Warsaw for breach of stadium rules.
It seems that UEFA are not consistent with their policies on stadium safety:
Uefa have begun disciplinary proceedings against Celtic over the lighting of fireworks during the Champions League qualifier against Cliftonville.Full details of Celtic's problems can be found HERE and HERE
There's a big question mark here over UEFA's impartiality towards Celtic and an explanation is required.