Hundreds of thousands of Brazilians took to the streets Sunday, venting anger over government corruption and a souring economy a month after protests gathered more than a million people.

With cries of "Dilma out" and "corrupt government," marchers -- many wearing the yellow and green jerseys of the national football team -- called for President Dilma Rousseff's ouster and an end to impunity for corruption.

Brazil on Sunday braced for more huge demonstrations against government corruption, just one month after more than a million people took to the streets to protest graft and economic drift.

A massive corruption scandal at state-owned oil giant Petrobras, rising inflation on the back of soaring utility bills and a perceived eroding of workers' rights have fueled opposition to leftist President Dilma Rousseff, re-elected just last October.

U.S. President Barack Obama announced Saturday that Brazilian counterpart Dilma Rousseff will visit Washington on June 30, almost two years after she canceled a trip over a U.S. spying scandal.

Obama made the announcement during a bilateral meeting with Rousseff on the sidelines of the Summit of the Americas in Panama City.

A massive corruption scandal at Brazil's state oil company. Protests over the presumed massacre of 43 students in Mexico. An Argentine prosecutor's mysterious death. Economies slowed by falling commodity prices.

Several of the Latin American leaders gathering at the Summit of the Americas in Panama on Friday and Saturday are facing major political headaches back home, from scandals to protests and sinking approval ratings.

Brazilian police fired tear gas Friday to break up a protest in a Rio de Janeiro slum that erupted after a 10-year-old boy was killed in what officers called a shootout with drug traffickers.

Some 300 residents of the Complexo do Alemao, a sprawling group of shantytowns notorious for violence, blocked an access road to the area after the boy, Eduardo Jesus Ferreira, was killed by a gunshot -- the fourth person killed there in just over 24 hours.

Eleven people were killed Sunday in clashes in eastern Brazil between police and gangs that also left two officers injured, media reports said.

Seven people suspected of belonging to a gang of bank robbers were killed in the town of Currais Novos in northern Rio Grande do Norte state, while four supposed drug dealers died in a shootout with police in the Rio slum of Mangueira.

The United States has again invited Brazilian President Dilma Rousseff to visit the United States, seeking to restore ties rattled by revelations of American spying against her and her country.

U.S. Vice President Joe Biden extended the invitation by telephone last week, said a spokesman for the Brazilian presidency on Tuesday.

Brazil's Supreme Court on Wednesday rejected an opposition request that President Dilma Rousseff be investigated as part of a widening probe into a multi-billion-dollar corruption scandal at state oil giant Petrobras.

The justice in charge of the case, Teori Zavascki, turned down the petition on grounds it contained "technical errors," the court's press office said.

Public support for Brazil's President Dilma Rousseff plunged to 13 percent after mass protests over the weekend against government corruption, a new poll published on Wednesday found.

The Datafolha poll underscored the swiftness of Rousseff's fall from grace since her re-election to a second term as leader of the South American powerhouse less than three months ago.

Brazilian police launched a new round of arrests Monday in the corruption scandal at state oil giant Petrobras, a day after massive nationwide demonstrations against leftist President Dilma Rousseff.

Federal police said they had warrants for the arrest of 18 people in connection with the 10-year scheme of kickbacks and political payoffs that allegedly siphoned off $3.8 billion from Petrobras.