Activists in Argentina called for women across the country to walk out of work for an hour on Wednesday in protest over the horrific rape and murder of a teenage girl.
Lucia Perez, 16, died earlier this month in the city of Mar del Plata.
Two men who left her at a hospital said she overdosed on drugs. But doctors found evidence she had been subjected to extreme sexual violence.
A march is planned for 17:00 local time (20:00 GMT) in Buenos Aires. There will also be vigils in other Argentine cities and around the world, including in London.
Activist groups called on women to wear black and to leave their places of work for an hour at midday on Wednesday (14:00 GMT). They are calling the actions “Miercoles Negro” – Spanish for Black Wednesday.
“In your office, school, hospital, law court, newsroom, shop, factory, or wherever you are working, stop for an hour to demand ‘no more machista violence’,” the march organisers wrote.
Machismo is the Spanish word for an exaggerated form of masculinity, which campaigners say engenders attitudes that in their extreme form lead to men killing women.
Tens of thousands of people rallied in the streets in June last year in protest at violence against women, and repeated marches and rallies have taken on the slogan “ni una menos” – Spanish for “not one woman less”.