Quickly perusing aviation transport forums I see that at least some jet turbine engine mounting systems have bolts that are designed to shear given a high enough lateral load. There are generally only 3 or 4 bolts, with each mount specialized to accommodate a normal load in a specific plane but all designed to breakaway if necessary.
Another reference states that all Boeing transports subsequent to the 707 do have shearable bolts or pins on the engine mounts.
KTVU confirms 2 killed, 61 injured