China rejects Australian parliament cyber attack claims as 'baseless' and 'irresponsible'

Foreign ministry spokesman says speculation and sanctions will only 'poison the atmosphere for cooperation'

China has hit back at suggestions it was behind a sophisticated cyber attack on Australia's political parties, warning "irresponsible" and "baseless" speculation will heighten tensions.

The prime minister, Scott Morrison, revealed on Monday cyber experts believe a state actor was responsible for the attack, which also targeted the networks of federal parliament, but didn't say which country.