Police in Brazi carried out a massive anti-murder operation across every state, arresting 968 suspects in just one day.
Officers shared real-time updates of the so-called Operation Cronos on social media, including photos and videos.
Of the detained, 56 people have been accused of gender-based killings and domestic violence.
Officials said they hoped "to prevent future crimes" by "imprisoning murderers".
During the first phase of the operation in August, police arrested nearly 3,000 people.

US military targets IS in Syria strikes
Israeli fire kills three people in Gaza, tension rises
Tens of thousands protest in Minneapolis over fatal ICE shooting
One dead in Australian bush fires
