On 20 May, the students of Rosario announced a national strike (similar protests took place in other provinces). On 21 May, university student groups and secondary school students, along with the CGT, organized a silent march, which gathered 4,000 people. The police sent to put down the protest had to retreat, but killed 15-year-old student Luis Blanco. This was later known as the first Rosariazo. That evening the city was declared an emergency zone under military jurisdiction. A massive worker strike was declared on 23 May in Rosario and the nearby Industrial Corridor. Blanco's funeral was attended by more than 7,000 people.