UPDATE: Bomb robots, police scour family home of Pullenvale explosives suspect

Police have raided the Newcastle homes of the parents and ex-girlfriend of Daniel Fing, who has been connected with a cache of explosives at a Queensland property.

A ’ bomb robot’ and detectives have today searched two homes in Waratah and Belmont North.

Images obtained by 9NEWS show the bomb robots travelling across the kerb and on to the two properties.

At the original site in Pullenvale, on the western outskirts of Brisbane, defence force personnel today finished their search of the Pullenvale, Brisbane home where the stockpile of explosive chemicals was found last week, reportedly along with crudely-drawn maps detailing an area around Sydney's busy Central station and another area in Newcastle.

Around 25 Australian Defence Force troops with metal detectors and sniffer dogs scoured the property for around four hours this morning, focusing in particular on a lot to the rear of the house.

Additionally, a hazardous chemical clean-up team spent considerable time inside the shed where the majority of the materials were discovered.

Mr Fing was convicted in 2006 of blowing up the car of his ex-girlfriend’s new lover.

He has been arrested in Newcastle over an unrelated matter.

Mr Abbott said he wasn't aware of any threats to those sites, nor anything that would indicate a threat towards November's G20 summit of world leaders in Brisbane.

"There are all sorts of people who do all sorts of weird and, at times, pretty dangerous things," Mr Abbott told ABC Radio in Brisbane.

"But I haven't been advised of any potential terrorist threat in respect of this particular issue."

The prime minister lauded Queensland police for finding and disposing of the explosives, saying security during and in the lead up to G20 would be as "effective as it needs to be".

Police have refused to confirm media reports that more than 50kg of explosive material was found at the home, including one known as DMDT, said to have been used in the bombings that targeted London's transport network in 2005.

The material was disposed of in a series of controlled detonations last week.

The whereabouts of a woman who also rented the house are not known.

The chemicals were discovered after the pair abandoned the property after falling behind in their rent.