Cluster bombs should do the trick, and are deployed in such fashion from time to time.

Think of it as dropping a cannister full of a couple hundred hand grenades, with a typical spread about 1.5 times the width of the plane wingtip to wingtip, with several planes in V formation.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)