The man convicted of the Lockerbie bombing published documents on the internet today and claimed they would prove his innocence.

Hundreds of pages relating to an appeal against the conviction of Abdelbaset al-Megrahi were put into the public domain on the Megrahimystory.net website.

Megrahi, who has terminal prostate cancer, was last month freed early by the Scottish justice secretary, Kenny MacAskill, on compassionate grounds from the life sentence he was serving at Greenock prison, in Scotland, for the bombing of Pan Am flight 103 in 1988.

Before his release – which prompted fury from many of the relatives of the US victims of the bombing, in which 270 people died – Megrahi dropped his second appeal against the conviction.

His Scottish lawyers, Taylor & Kelly, said today the documents published on the website related to that appeal.

A spokesman for the firm said Megrahi hoped to continue to publish details of his appeal challenge in the forthcoming weeks.

"I have returned to Tripoli with my unjust conviction still in place," Megrahi said in a statement.

"As a result of the abandonment of my appeal, I have been deprived of the opportunity to clear my name through the formal appeal process.

"I have vowed to continue my attempts to clear my name. I will do everything in my power to persuade the public, and in particular the Scottish public, of my innocence.

"Through my website, I have published the material which featured in the first full hearing of my appeal."

The material includes documents on the grounds of his appeal and the "legal sufficiency and reasonableness" of court findings.

"I hope that this can assist in the understanding of my case, especially for those who have been most profoundly affected by it," Megrahi said.

"As can be seen from the documents released today, some of the challenges mounted before the court are supported by the Scottish Criminal Cases Review Commission."

Argument had been heard on the challenges but the appeal court had not been able to give its opinion by the time he dropped his appeal, he said.

The Libyan had been told he would serve a minimum of 27 years after being convicted in 2001.

There has been a long-running campaign, supported by the relatives of some British victims, to have his conviction overturned amid fears there are serious doubts about it.

Megrahi was convicted by a three-judge Scottish court convened in the Netherlands. He appealed unsuccessfully in 2002.

In 2007, the Scottish Criminal Cases Review Commission, which investigates possible miscarriages of justice, sent his case for a second appeal.

That process got under way earlier this year, but has been left in legal limbo by his decision to drop the appeal.

The documents published today relate to the grounds of appeal which were argued at the appeal court in Edinburgh between 28 April and 19 May.