Iraqi officials say they are investigating an attack on a Sunni mosque that killed at least 68 people on August 22.
Parliament speaker Salim al-Jaburi, a Sunni, told the media in Baghdad that a committee of security officials and lawmakers would announce the results of the investigation by August 25.
Jaburi said the attack was carried out by "the same hands [of those] who want to derail the process of building the government."
The massacre in the Imam Wais village near Baquba has raised sectarian tensions in Iraq and led two Sunni political blocs to withdraw from talks on forming a new government with Prime Minister-designate Haidar al-Abadi.
Police say gunmen broke into the mosque and opened fire on worshippers during Friday Prayers.
The village is in Diyala Province, some 120 kilometers northeast of Baghdad.