Tel Aviv Municipality Building lights up with the Egyptian flag, November 24, 2017 (Haggay Hacohen)

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The facade of the Tel Aviv-Yafo municipality building wore red, white, black and golden hues on Friday night as it was lit up in solidarity with Egypt, which suffered a mass casualty terror attack on Friday.The municipality building, situated in Tel Aviv's Rabin Square, donned the colors of the Egyptian flag in an expression of Israeli support for its southern neighbor, as Egypt continues to reel from the attack that claimed the lives of at least 235 worshipers at a mosque in the northern Sinai after Friday prayers.The mayor of Tel Aviv, Ron Huldai, expressed his condolences to Israel's southern neighbors in Egypt."A horrific attack in Egypt. We send our condolences to our friends across the border and light the Municipality building in their honor," wrote Huldai on Twitter.Reuters reports that witnesses saw terrorists enter the mosque to kill worshipers during Friday prayers, when mosques see the largest attendance. The attack began around noon time. They also attempted to prevent rescue services from reaching the area.No group claimed responsibility for the assault but it was the deadliest yet in the region where for three years Egyptian security forces have battled an Islamic State insurgency that has killed hundreds of police and soldiers.Sinai has been the scene of increasingly deadly attacks as security forces fight against terror networks associated with an ISIS-affiliate.The iconic Tel Aviv building was similarly illuminated with the Egyptian flag in May 2017 to commemorate the victims of a deadly attack on a bus carrying Coptic Christians in Cairo. Islamic State claimed responsibility for the attack.Reuters contributed to this article.