LONDON: Britain’s main opposition Labour Party on Saturday branded an Israeli airstrike that leveled a media building in Gaza as “completely unacceptable,” as up to 100,000 protesters marched through central London to show solidarity with the Palestinian people.

The high-rise building, which hosted offices for journalists from international outlets such as the Associated Press and Al Jazeera, was destroyed on Saturday afternoon.

The strike leveled the building an hour after people were told to evacuate. It followed an earlier Israeli attack in Gaza City that killed eight children and two other Palestinians from an extended family.

“The targeting of media offices in Gaza by Israeli air strikes is completely unacceptable. Press freedom is a fundamental right,” said Labour Shadow Foreign Secretary Lisa Nandy.

“The devastating escalation of violence — including Hamas rocket attacks on Tel Aviv and air strikes on the Gaza City refugee camp — has cost more civilian lives and we condemn it in the strongest possible terms,” she added.

“The UK must join our international partners in calling for an immediate ceasefire, an end to all rocket attacks and air strikes, and work with both Israeli and Palestinian leaders to prevent this dangerous situation deteriorating further.”

Labour MP Diane Abbott told the crowd at the London demonstration: “We must remember we’re part of an international movement. This is a worldwide movement for justice.”

She added: “Palestinian people are having their land seized ... and they’re now being killed in their homes. All of this is illegal.”