Mexicans march over 1968 killings
Thousands of people in Mexico City have paid tribute to those who died when security forces opened fire on a student demonstration 40 years ago.
The killings took place a few days before the Mexican capital hosted the 1968 Olympic Games.
The number of deaths in the incident is still disputed and no one has ever been jailed for involvement.
There were scuffles between police and demonstrators at the anniversary march, and about 20 people were arrested.
The government of the time said about 30 people died, but human rights groups and foreign journalists say about 300 were killed.
In the past decade, the Mexican authorities have set up several investigations into the deaths, but nobody has been jailed.
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The killings took place a few days before the Mexican capital hosted the 1968 Olympic Games.
The number of deaths in the incident is still disputed and no one has ever been jailed for involvement.
There were scuffles between police and demonstrators at the anniversary march, and about 20 people were arrested.
The government of the time said about 30 people died, but human rights groups and foreign journalists say about 300 were killed.
In the past decade, the Mexican authorities have set up several investigations into the deaths, but nobody has been jailed.