Disrupting electric supply, water supply, and food supply chains are already tried and tested separately, with some limited monetary system disturbances, here and there. So doing those simultaneously - possibly leveraging on latent vulnerabilities kept covered for later abuse - sounds a natural step 'forward', close to trivial for those into that. Causing huge broad disturbances and possible unrest in societies. So that some governments started to ask people to build up reserves.

I can imagine that terrorist are sad now that they cannot use their preferred advanced bioengineering skills acquired through great efforts posing as scientist towards the so far unsuspecting services providing them with harmful DNA building blocks and now have to turn to much much more pedestrian methods instead of the heightened sophistication they crave.

Or to sources from other countries.