Tens of thousands of mourners marched through Gaza in mass funeral processions on Thursday (November 9), honouring 18 people killed by Israeli shelling, an event Palestinians said would be marked as a "Black Day". The bodies of the dead were picked up from hospital morgues at mid-morning before being born aloft through the streets of Beit Hanoun, the town just outside Gaza City where Wednesday's attack took place. Militants from various Palestinian factions joined the marches, shouting "God is great". Burials and mass prayers were due to take place towards midday. On the outskirts of Beit Hanoun, fresh graves were dug in a new cemetery on empty land. A few hundred metres away Israeli troops were visible operating on land just outside Gaza. Amid the mourning, Gazans also vowed revenge against Israel, whose leaders have expressed remorse for the killings, which military officers said were probably the result of artillery rounds overshooting their target. In Gaza City, dozen of children surrounded a burning tire, chanting slogans against Israel. Shops were closed as a sign for the three-day mourning that was declared across the Palestinian territories. In East Jerusalem dozens of schoolgirls marched in protest at Israeli action. Police scuffled with some of the protesters and arrested some youths. Israeli police declared a high security alert and the army said there would be no let-up in operations against militants.