Albert Barnes Commentary Esther 3:15

"The posts went forth in haste by the king`s commandment, and the decree was given out in Shushan the palace. And the king and Haman sat down to drink; but the city of Shushan was perplexed." — Esther 3:15 (ASV)

Shushan was perplexed — Susa was now the capital of Persia, and the main residence of the Persians of high rank. These, being attached to the religion of Zoroaster, would naturally sympathize with the Jews, and be disturbed at their threatened destruction. Even apart from this bond of union, the decree was sufficiently strange and ominous to perplex thoughtful citizens.