>>I would suspect that the mortar to that part of the wall was suspect. At best you could hope that the mortar there was weak because they were running out of stuff and "stretched the mix" at worse it could all be suspect and the rest is waiting to break up.
Chances are it's either movement or it's had a knock. Mortar is supposed to be weaker than the bricks, it has no tensile strength for design purposes.
My gateway had brick piers with a farm gate. Somebody gave the latch-post a tap and of course it broke the mortar right through. The boss wants the brick piers reinstating but I've dissuaded her, somebody is bound to hit one soon after. I'm putting 7" farm gate posts in.
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