Posted by 
Hundreds of Palestine supporters have marched through Sydney in protest against the Opera House being lit up in blue and white in support of Israel following attacks by militant group Hamas.
The conflict has so far killed at least 700 people in Israel, including 260 at a music festival, and seen around 130 people taken hostage.
Israel has responded by launching a devastating barrage on the Gaza Strip, killing at least 436 Palestinians, including more than 80 children.
READ MORE: A 'Pearl Harbour' moment: Why didn't Israel's sophisticated border stop attack?
Israel has also cut power to the densely populated enclave, making it increasingly difficult for health workers to treat the more than 2200 injured people in Gaza.
About 6pm on Monday, hundreds of people began gathering outside Sydney Town Hall before moving through the CBD towards the Opera House.
People carried Palestinian flags, wearing black, white, red and green, and carrying banners with messages such as "Apartheid, wrong in South Africa, wrong in Palestine" and "Free Palestine".
Prime Minister Anthony Albanese had earlier called for the march to be called off out of respect for the loss of life in Israel since Saturday.
"The actions of Hamas in this is completely indefensible," Albanese told 2GB radio this afternoon, adding that "this was people killing innocent civilians".
There was a heavy police presence keeping an eye on the march, with both mounted officers and some on foot.
EXPLAINED: What you need to know about the Hamas attack on Israel
The group organising the march said it would be a "mass, peaceful protest".
Sydney's Jewish community said police had warned them to stay away from the Opera House while it was lit up.
"NSW Police and Community Security Group (CSG) are urging the community not to attend the Sydney Opera House precinct or Town Hall this evening," the NSW Jewish Board of Deputies said in a statement.
"Community members already in the CBD should also be vigilant as protesters are likely to seek to march from Town Hall to the Sydney Opera House.
READ MORE: Family plea after video shows unconscious woman in Hamas' hands
"The events tonight may pose a risk to the safety of community members and you are strongly urged not to attend.
"NSW Police and the CSG have confirmed unequivocally that it is safe to continue to participate in all official Jewish communal events and to send your children to school in the usual way."
The Opera House was one of several Australian landmarks, including Parliament House in Canberra and the Adelaide Oval, to be lit up in blue and white on Monday in support of Israel.
Israel-Hamas war: What we know so far
- Hamas militants crossed into Israel by land, sea and air in the early hours of Saturday morning. The militants infiltrated 22 towns and army bases. Civilians and soldiers were killed and taken hostage.
- At least 700 people have reportedly been killed in Israel.
- Israel formally declared war on Hamas on Sunday and has been pounding Gaza with airstrikes.
- More than 400 Palestinians have reportedly died. Hamas has fired over 4000 rockets into Israel.
- The Wall Street Journal today reported Iran helped Palestinian militants plan their shock assault. Iran has denied it was involved in the attack, but has supported it as "wholly legitimate".
