Four opposition leaders, questioned today for revealing details of a toll concession agreement, have not handed over any document despite a request from police.

Parti Keadilan Rakyat (PKR) treasurer Khalid Ibrahim, information chief Tian Chua, PAS treasurer Dr Hatta Ramli and DAP NGO chief Ronnie Liu had been summoned last week for investigations conducted at police headquarters in Kuala Lumpur today.

The four arrived at Bukit Aman at 10am, accompanied by their team of lawyers comprising Kamarul Hisham Kamaruddin, Shamsul Iskandar Mohd Akin, Hanipa Maidin and A Sivanesan.

About 40 supporters gathered outside the premises, displaying banners and placards criticising the use of the Official Secrets Act (OSA) for the investigations, and calling for full disclosure of the toll agreements signed between the government and highway concessionaires.

Among those present were ex-PKR Youth chief Mohd Ezam Mohd Nor, who had spent two years in jail for alleged breach of the OSA in relation to findings of investigations against two high-profile politicians

. He later won an appeal that quashed the conviction on technical grounds.

Following questioning, the four opposition leaders emerged from the building about 1.45pm, to shouts of 'Down, down OSA!' by their supporters.

Speaking to reporters, Chua would not reveal details about the questioning apart from saying that the four had given full co-operation to the police, who had asked "routine questions".

He confirmed that no documents had been handed over to the police despite a request.

"No material has been provided. We just went there and they (the police) asked questions," Chua said, adding that they have not been informed as to whether there would be another round of questioning.

He reiterated the opposition stand against the use of the OSA to "cover up issues of public interest".

About an hour later, the police conducted separate searches at Chua's office and residence.

'Specific knowledge required'

Lawyer Kamarul Hisham expressed confidence that the four have a good defence.

He pointed out that those accused of breaching the OSA must have specific knowledge that the documents involved have

already been classified 'secret'.

"If you have no knowledge that these materials are OSA-classified, there cannot be an offence to begin with," he told malaysiakini .

He said the authorities must also prove that the documents have been classified secret under the OSA.

"The public only found out that (the toll agreement) was classified under the OSA when the announcement was made (by Works Minister S Samy Vellu)," the lawyer added.

The four leaders had on Jan 4 shown reporters a copy of a document pertaining to the toll concession agreement for the Lebuhraya Damansara-Puchong highway, operated by Litrak.

They argued that the 200-page document showed that the government had guaranteed profits to the concessionaire at the expense of road users.

The police are investigating the matter under Section 8 of the OSA, based on a report made in Damansara. However, it is not known who lodged the report.

Anyone found guilty of violating the Act is liable to a mandatory jail sentence.

Various groups have objected to the police move to probe the four under the OSA.