The posters reflect the strong ties between Iran and the Hamas and Islamic Jihad militant groups in Gaza. Israel considers Iran to be its most dangerous enemy, citing Iran's support for the militants and its suspect nuclear program.
During the fighting, Gaza militants groups fired hundreds of rockets into Israel, including Iranian-made missiles reaching as far as Tel Aviv.
The posters, displayed in three locations in Gaza City, show the Al-Aqsa Mosque in Jerusalem, surrounded by Iranian and Palestinian flags, two hands in a handshake with the words, "Thank You Iran" in Arabic, Hebrew, and Farsi.
Hamas and Islamic Jihad leaders have also publicly thanked Iran.