Waheed Omar, Afghan President Hamid Karzai's spokesman, also added that Mr Fitrat was himself under investigation.
The demonstrations came as new President Waheed Hassan was to deliver his inaugural presidential address.
Waheed Arshad, denied some local news reports that the president's plane was targeted by a rocket.
Peace is our way, said Abdul Waheed Khan, UNESCO's Assistant Director-General for Communication and Information, closing the Forum.
"Libraries are key actors for ensuring universal access to information and for building knowledge societies", said Abdul Waheed Khan.
Three others were found not guilty of plotting to bomb aircraft: Ibrahim Savant, 28, Arafat Khan, 28, Waheed Zaman, 25.
Mr Nasheed says he was forced to resign on 7 February by an army "mutiny", a claim denied by Mr Waheed.
He was the country's first democratically elected leader but was forced to resign in February and replaced by his deputy, Mohamed Waheed.
New Maldives President Mohammed Waheed Hassan has vowed to uphold the rule of law following the dramatic resignation of his predecessor Mohamed Nasheed.
Speakers at the rally included Lord Waheed Alli, the first openly gay peer, Peter Tatchell, Gay and Human Rights Campaigner, co-founder of OutRage!
Last week Mr Waheed hinted that early elections may be considered.
Mr Nasheed, who was succeeded by his deputy, Mohamed Waheed, has said he was forced to quit by threats of violence from rebellious police and soldiers.
Waheed Adenrele-Yusuf, head of the Nigerian branch, said he is now in overall control, following the impeachment of Rafiu Ladipo, who held the position of president-general.
Also Sunday, two members of the paramilitary Frontier Corps were killed in clashes in the Bolan district of the southwestern province of Baluchistan, said government official Waheed Shah.
Mr Nasheed says he was the victim of a coup but this is denied by the security forces and President Waheed who says elections will be held in July 2013.
Downplaying the Afghan president's comments on Monday, Waheed Omar, Mr Karzai's spokesman, told news agency AP he had not been criticising the overall strategy, and he had confidence in Gen Petraeus.
BBC: Clinton defends US Afghan policy after Karzai criticism
President Mohamed Waheed called it a "remorseless and foul act" and the president's media secretary sent out a text describing the murdered MP as the "strongest critic" of ex-President Mohamed Nasheed.
The announcement was made by UNESCO's Assistant Director-General for Communication and Information, Abdul Waheed Khan, and IFLA's President Alex Byrne, last week in Seoul, on the occasion of the 72nd IFLA General Conference and Council.
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