Not me
Because they were returning from holiday or the other way can't remember. Each time they pass traffic is halted so this makes them bunch convoys together and get it over in fewer trips. Well, we saw this can lead to a security lapse or rather present itself as a target.
Now Hooda said, the explosive was sourced locally as there is lot of construction work going on in Kashmir. But i've seen reports stating that RDX was smuggled in. It had to be RDX as the there was no trace of the bus after. You don't need 350kg, under 100kg is already plenty. RDX is pretty hard to find in India it started getting harder to find over ten years back when i pointed out the number of casualties were decreasing with each attack.