Australia plans tougher anti-terror laws after recent raids on suspects

The Australian government will introduce tough new legislation in parliament this week to tackle terrorism, reports said yesterday, following the biggest crackdown in the country's history.

Prime Minister Tony Abbott will seek sweeping counterterror powers when the proposals go before the house on Wednesday, NewsCorp Australia reported.

Thursday's unprecedented raids in Sydney and Brisbane had foiled a plot by Islamic State jihadists to carry out gruesome "demonstration executions" which could have taken place within days, Abbott said.

Security has also been stepped up in the capital, Canberra, and at military bases, airports and sporting events after parliament and government officials had been mentioned as potential targets in "chatter" between extremist networks in the Middle East and Australia.

Fifteen people were arrested when hundreds of police officers raided dozens of homes in Sydney and Brisbane on Thursday, but only one person remained in custody yesterday, officials said.

Omarjan Azari, 22, was charged with planning a terrorist act that prosecutors said was intended to "shock, horrify and terrify" the community and involved the "random selection of persons to rather gruesomely execute" on camera.