An Australian man and his wife are being mourned by Sydney's Muslim community, as their reported deaths bring the number of Australians believed killed in the Syrian conflict to seven.

Yusuf Ali and his wife, Amira, of Queensland and formerly Granville were ''in their house in Syria and the FSA [Free Syrian Army] attacked and killed them'', Amira's sister Rose posted on Facebook on Saturday.

"Syria is in serious chaos right now": Zaky Mallah.

''Please everyone make dua for my sister Amira Ali and brother Inlaw Yusuf. They hav been martyred and insha'allah they r shaheeds. May Allah SWT grant them both janah Ameen,'' wrote Rose, who is known on Facebook as ''Mujahidah Lioness''. ''May Allah make the mujahideen victorious against FSA and Assad's regime.''

Amira, nee Karroum, was 22 and nicknamed ''Squid''. She left St Hilda's, an exclusive Anglican school for girls at Southport on the Gold Coast, in 2009, and married Yusuf Ali in 2012.