Tens of thousands of protesters take to the streets of London demanding a permanent ceasefire in the war between Israel and Hamas, as a temporary truce largely held in Gaza is ongoing. "How can we just sit here and not do something," says Shiba Haydar. The gathering is the latest large pro-Palestinian demonstration in the British capital since the unprecedented Hamas attacks on Israel unleashed the latest conflict in the Gaza strip. Hamas fighters snatched around 240 captives when they broke through Gaza's militarised border with Israel, killing about 1,200 people, according to Israeli authorities. In response, Israel launched an air, artillery and naval bombardment alongside a ground offensive, killing nearly 15,000 people, according to the Hamas government in Gaza. IMAGES AND SOUNDBITES