A Belgian feminist group poured about 25 gallons of fake blood on the floor of an airport in Liege, Belgium, to protest its belief that the airport is being used to transport arms to Israel.

Six women from the Liliths activist group emptied the red liquid onto the floor of the cargo airport on Aug. 26, the English-language RT news website reported Saturday.

The women, wearing t-shirts with the colors of the Palestinian flag, unfurled a banner which read “How many tons of weapons for so many liters of blood?”

The demonstration came on the same day that Israel and Palestinian groups in Gaza agreed to an open-ended cease-fire, following Israel’s seven-week operation in Gaza.

The women were detained by police. The Liege airport said it would file a complaint against the women, according to the French-language dhnet news website.

An airport spokeswoman told dhnet that no weapons pass through the airport. “This is an unfounded rumor you hear every time there is a spike in the Israeli-Palestinian conflict,” the spokeswoman told the website.