Protesters gathered in border towns across northern Mexico
Hundreds of people in Mexico have blocked key crossings into the US in protests against the deployment of the army to fight drug traffickers.
Traffic was brought to a halt on a number of bridges in several border towns in northern Mexico.
The protesters accused the army of abuse against civilians. Government officials said the blockades had been organised by drug gangs.
Some 40,000 troops have been deployed since 2006 against the drug gangs.
More than 5,400 people were killed in drug-related violence last year, Mexican officials say.
Violence continued on Tuesday in the border city of Juarez where three police officers were shot dead by unidentified gunmen.
Powerful drug cartels have been fighting both each other and federal forces as they battle to control the immensely lucrative routes trafficking cocaine and other drugs from Colombia to the US via Mexico.
In some parts of the country, the army has taken over the role of the police, which have often proved easily corrupted when bribed or threatened by the gangs, says the BBC's Stephen Gibbs in Mexico City.
The protesters blocked bridges in Ciudad Juarez, Nuevo Laredo and Reynosa.
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