Suspicious package found at Troy Buswell*s Busselton electorate office (ABC)

ABC A package containing a white powder has been found at Troy Buswell's electorate office.

Former WA treasurer Troy Buswell's Busselton electorate office has been locked down after police received a report of an envelope leaking white powder.

Police were alerted to the suspicious package bout 5:45pm after staff found it while sorting incoming mail.

The building was evacuated and police sealed off the office while they waited for the arrival of a specialist chemical analysis team.

The Prince Street office has been sealed off and officers are awaiting the arrival of a specialist chemical analysis team, Inspector Derek Staats said.

Five suspicious packages, which were found to contain flour, have been discovered in the past week, including a number addressed to high-profile politicians.

In a statement WA Police spokesman Dominic Wood said police were at Mr Buswell's electorate office.

"It's too early to confirm the details of any written content, but it is likely that this is linked to similar letters addressed to the electoral offices of the Premier and Treasurer, Parliament House, the West Australian and the Taxi Board last week," Mr Wood said.

Packages addressed to Treasurer Mike Nahan, Premier Colin Barnett, the editor of The West Australian and the Taxi board were discovered on Wednesday.

A fifth was discovered Thursday at Parliament house, also addressed to the Premier.

Security has been heightened around WA ministers following the discovery of the envelopes.

The previous envelopes had threats printed on them.

Following the discovery of the earlier envelopes, WA Police Commissioner Karl O'Callaghan said even though the powder was found to be flour the incidents were being taken seriously as they represented a threat against senior people in Government.

Mr Buswell could not be contacted for comment.

He has remained out of the public eye since stepping down as treasurer and later being charged with a series of driving offences allegedly committed in February.

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