Mexico City: Protesters angry at the presumed massacre of 43 students clashed with police outside Mexico`s National Palace on Thursday after a massive march demanding President Enrique Pena Nieto`s resignation.
The face-off marred a mostly peaceful rally of tens of thousands of black-clad people in the capital, where they waved blackened Mexican flags and chanted "Urgent! Urgent for the president to resign!"
Parents of the 43 male college students, who reject claims their sons are dead and demand the government find them alive, led the latest nationwide demonstration to the historic National Palace.
Shouting "Pena Nieto Out," some protesters threw powerful firecrackers at the fenced-off palace, which Pena Nieto only uses for ceremonies.
Hundreds of riot police sprayed water and fired tear gas at protesters. Some charged the officers, kicking at their shields. Other protesters shouted "No violence!"
The crime has infuriated Mexicans fed up with corruption, impunity and a drug war that has left more than 100,000 people dead or missing since 2006.
The case has turned into the biggest challenge of Pena Nieto`s nearly two-year-old presidency, on top of another scandal over a mansion his wife bought from a government contractor.
Prosecutors say a drug gang confessed to slaying the students and burning their bodies after receiving them from corrupt police in the southern state of Guerrero in September.
"Mexico is used to tragedy, robberies and corruption, and we need to begin to exercise our rights as citizens to get the government working," said Lili Correa, 46, wearing black.
The demonstration coincided with the anniversary of the start of the 1910 Mexican revolution, prompting the government to cancel the annual parade.
Before the march, masked protesters threw firebombs and used bazooka-like tubes to launch firecrackers at riot police, who hit back with tear gas to disperse the group on a street near the airport. Around 15 people were detained.
Protesters also blocked the main road to the airport for an hour. Police vehicles picked up passengers walking with their suitcases along the road.
Thousands protested in several other cities, including Chilpancingo, the capital of Guerrero, the violence-plagued southern state where the students vanished nearly two months ago.
Thousands more marched in Bolivia and some 200 took to the streets in El Salvador.
Mexico and Real Madrid football star Javier "Chicharito" Hernandez tweeted a picture of himself wearing a black hoodie and the hashtag #WeAreAllAyotzinapa, referring to the young men`s Ayotzinapa teacher-training college.
"This is a nationwide problem. Nothing like this happened before and Pena Nieto doesn`t care, he`s useless," said Luis Angel Garcia, a 19-year-old Ayotzinapa student.With the annual parade called off, Pena Nieto led a ceremony with top officials at the Campo Marte military field, where he and the defense minister denounced violent protests.
"Mexico is hurting, but the only path to soothe this pain is through peace and justice," he said, hours after making his personal assets public to quell conflict of interest allegations over his wife`s mansion.
Defense Minister Salvador Cienfuegos said violence "only leads to national failure, social backwardness, ungovernability, instability."
The crisis erupted after the mayor of the city of Iguala ordered police to confront students on September 26, sparking a night of violence that left six people dead and 43 missing, authorities say.
Members of the Guerreros Unidos drug gang told investigators they killed the students and burned the bodies after police had handed them over.
Officials stopped short of declaring the students dead pending an Austrian university`s DNA tests on charred bones. Federal authorities continue to search for them in Guerrero.Buses carrying parents of the missing students joined the march after a week-long tour of the country to voice their anger over the government`s handling of the case.
Highlighting their deep distrust of the government, they refuse to accept that the students are dead and say they will only trust DNA test results from independent foreign forensic experts.
"We are moving forward, until the end, until they reappear," Epifanio Alvarez, father of a missing student, told AFP.
"The situation is bad. There are many missing people all over the country."