Budapest, Hungary ? Thousands of protesters demonstrated outside parliament for a fourth day Wednesday demanding Hungary’s prime minister resign over a leaked recording in which he admitted his government lied about the dismal state of the economy.

The demonstrators’ numbers swelled to about 15,000 by late evening, but Prime Minister Ferenc Gyurcsany stood his ground, insisting his government intended to press ahead with economic reforms.

Several violent outbursts during the dayslong protests have left about 140 officers injured, including 38 early Wednesday, and 137 people have been detained, said Arpad Szabadfi, deputy chief of national police. Dozens of demonstrators also were hurt, officials said.