Two homemade bombs targeted the headquarters of the Iraqi Communist Party, which is part of an alliance with cleric Moqtada Al Sadr that won Iraq's parliamentary election, a party official and security sources said.
The explosive devices were hurled into the garden of the building in Baghdad on Friday and did not cause any casualties, said Jassim Helfi, a senior member of the party.
He described the incident as a message from those opposed to the Sairoon bloc's calls for reforms in Iraq. Sairoon has promised to end corruption and foreign interference in Iraq's affairs.
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Mr Al Sadr scored a surprise victory in the election by promising better services and tapping growing resentment with Iran and what voters say is its support for a corrupt political elite.
The cleric himself cannot become prime minister because he did not run in the election, though his bloc's victory puts him in a position to have a strong say in negotiations on forming a new government.
Mr Al Sadr reached out to dispossessed Shiites and marginalised Sunnis, and restored links with Sunni neighbours while keeping Iran at bay.
The nationalist cleric's success could be a setback for Iran, which has steadily increased its influence in Iraq - its most important ally in the Middle East - since a US-led invasion toppled Saddam Hussein in 2003.
Before the election, Iran publicly stated it would not allow Mr Al Sadr's bloc to govern in Iraq, with which it shares a border.
