Added time: 03 March 2014, Monday 11:56
Thousands protested corruptions and briberies of government
The Turkish authorities have freed the sons of two former cabinet ministers pending trial, the latest twist in a major corruption investigation.
Baris Guler and Kaan Caglayan, arrested in December, among dozens of people held in an investigation into bribery relating to public tenders.
The inquiry enraged Prime Minister Recep Tayyip Erdogan, who saw it as a "plot" against him.
He responded with a purge of top police and judicial officials.
An Azeri businessman of Iranian origin, Reza Zarrab, was also released on Friday.
The son of a third cabinet minister was also arrested in December, but was soon released.
The three ministers - Environment Minister Erdogan Bayraktar, Economy Minister Zafer Caglayan and Interior Minister Muammer Guler - resigned in December as the police investigation intensified.
All three of them denied any wrongdoing.
Police are investigating allegations of illicit money transfers to Iran and bribery for construction projects.
Earlier this month Suleyman Aslan, the former chief executive of Halkbank, was also released.
He is suspected of money-laundering in connection with the alleged bribery.
When they searched his home police found $4.5m in cash hidden in shoeboxes.
Thousands people took out streets of main cities of Turkey and protested court'sdecisions about suspected figures of corruption and bribery cases in weekend.