The Red Cross on Friday reported a near doubling of the death toll from attacks on a rebel-held Yemeni seaport under siege by a Saudi-led coalition, describing the killings and destruction as a horrific disregard of international law.

As recriminations over Thursday’s attacks escalated, the Saudis and their military partners in the Yemen conflict denied any responsibility and blamed their enemies, the Houthis, the Yemeni insurgent group that controls the seaport, Al Hudaydah.

At least 55 civilians were killed and 170 were wounded by bombings that struck densely crowded areas of the seaport, including a fish market and areas around Al Thawra Hospital, the International Committee of the Red Cross said in a statement from its Yemen delegation. It did not identify who was responsible.

“The scenes coming from Hudaydah are horrific,” the statement said. “The disregard of international humanitarian law in Yemen cannot be tolerated.”