MILAN — Italy's fragile coalition government was pushed into a full-fledged crisis Saturday after ministers from former Premier Silvio Berlusconi's political party announced their resignations.

The resignation of the five ministers on Saturday, which were announced but not yet formally tendered, drew the ire of Premier Enrico Letta, who accused Berlusconi of a "crazy" gesture aimed at covering up his personal affairs.

The five-month-old government has teetered for weeks since the high court confirmed Berlusconi's tax fraud conviction.

Berlusconi's center-right People of Liberty Party is in an unusual coalition of rival forces with Letta's center-left Democratic Party, and the resignations signals the end of the alliance.

The resignations must be formally submitted to President Giorgio Napolitano, who must decide if there is any way to continue the government or if new elections must be held.

The announcement by the center-right ministers came after Berlusconi urged ministers in his party to step down if the government doesn't revoke an increase to Italy's value-added tax that takes effect next week.

Tensions already were swirling around a Senate committee vote next week on whether to revoke Berlusconi's legislative seat because of the tax fraud conviction.

Letta, in a statement issued by his office, said Berlusconi was using the sales tax increase as an alibi "to justify the crazy and irresponsible gesture, all aimed only to cover up his personal affairs."

Letta said it was Berlusconi who was forcing the government's hand on the sales tax by depriving it of the stability needed to push through alternative measures.

"The Italian people will know to return to the sender such a big lie and attempt to distort reality," Letta said.

Democratic Party leader Giuglielmo Epifani called the center-right ministers' move "irresponsible."

"They are provoking a crisis and we must evaluate exactly what the consequences are," he said.

Letta had warned on Friday that he will quit unless he receives prompt pledges of solid support in a confidence vote in Parliament on his government, which is struggling to pull Italy out of a recession.

Nearly all of Berlusconi's senators have vowed to quit, if a Senate committee votes next week to strip him of his Senate seat because of the conviction.