Due at an assault of a conductor at Rueil-Malmaison, the traffic on the RER A is shut down.
Result the whole Parisian transportation network is disrupted.
And even worse due to a technical problem (suspicious smoke), traffic is stopped on the line 14.
So in the busiest section of Paris (Gare de Lyon - Chatelet) only 2 lines out 4 run. The overcrowded metro line 1 and RER D.
Morning rush hour.