The string of killings of black men by police around the country has put departments under increasing scrutiny. Houston’s police department has been releasing statistics on incidents in which their officers fire their guns. So far this year, there have been 16 such incidents, during which 10 people were wounded and four were killed.

The latest shooting is being investigated by two separate divisions within the Houston police department, as well as by the district attorney of the county where Houston sits, Harris.

At the same time, police departments are also conscious of the potential for violence against them. After the attack in Dallas, Houston police officers were advised “to be vigilant, to be careful and to have increased awareness of the situations around them,” said Silva. Officers who normally ride alone were offered the option of patrolling in pairs for safety.

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