A CLEANING business owner used Facebook to threaten to ''kill all Christians and Jews'' and bomb Sydney, police allege.

Khaled Zakaria, 30, faced Parramatta Bail Court yesterday charged with one count of using a mobile phone to menace or harass and two counts of making hoax threats using a mobile phone.

New way to scare ... a bomb threat was posted on Facebook. Credit:Reuters

In documents tendered to the court, police said Mr Zakaria, of Greenacre, threatened to bomb intelligence agency ASIO, stab officers at Goulburn's super-max jail and ''get'' officers at Bankstown police station under the Facebook profiles Kay Zee, Khaled Ibn-Al Walid and Khaled Ibn-Alwalie.

Police alleged Mr Zakaria posted threatening comments on the Ban the Burka and Sharia for Australia Facebook pages, including: ''There's going to be a big bang in the City of Sydney on 30th of July, 2011. Watch out. Bang Bang.''