Heads of police replaced as wave of violence continues in Brazil's largest city

Brazil's largest city has sacked its two main police chiefs as it battles a wave of killings.

New Sao Paulo state security chief Fernando Grella replaced civilian and military police chiefs on Monday. He himself just took over the job four days ago.

The violence continues. According to the newspaper Estado de Sao Paulo, 15 people were shot to death between Saturday and Sunday.

The deaths include both police officers and civilians.

The murder rate has risen for months. The Public Safety Department says 144 people were killed in September and 150 in October.