According to the article the "It showed an image of Arabic text overlaid on a green flag carrying the name of the third Shi'i Imam, Imam Husayn.
It also included a poem in Persian which said: "We shall strike if the leader orders, we shall lose our heads if the leader wishes."
Also included were the words: "Those that wage fight on the path of God win."
For it's part Twitter has admitted that it's Domain Name Server (DNS) records had been "temporarily compromised".