REPUBLIKA.CO.ID, BUCHAREST -- Romania's Prime Minister Victor Ponta was questioned by prosecutors on Monday as part of a corruption probe that has sparked calls for him to resign.

Ponta hobbled on crutches through a crowd of reporters into the headquarters of the anti-corruption agency (DNA) without making any comment.

After returning to work on Thursday following a month-long stay in Turkey for a knee operation, Ponta said on Sunday he was stepping down as head of the Social Democrat party while he fought the corruption allegations, but said he would stay on as premier.

In June the DNA launched a probe against him for fraud, tax evasion and money laundering dating to 2007-11, before he became prime minister in 2012.