The National Law Enforcement Officers Memorial Fund says police killings are up sharply in 2016, rising 44% compared to the same period last year.

USA Today:

The deaths of four Dallas police officers and one Dallas transit officer from sniper fire during a protest in the city Thursday raised the national total of firearm deaths among police to 26. This compares with 18 at this point in time in 2015, said Nick Breul, director of research for the fund in Washington, D.C.

Breul said it was also the latest of 11 ambushes of police officers so far this year across the country, already outpacing the eight ambushes of law enforcement that occurred last year.

"That's certainly a concern for us. It's troubling and it's something that we watch," Breul, a former Washington, D.C., police officer, said about the shootings. "It's really an assassination. You're taking advantage of an officer and you're ensuring that you're able to kill them through them either being vulnerable or through a complete surprise attack."

Breul said the last major ambush targeting police occurred at a coffee shop in Lakewood, Wash. on Nov. 29, 2009, when a gunman walked in and opened fire on four city police officers working on their laptop computers preparing for their work shifts. All four were killed. The gunman died two days later in a shootout with police.

Forty-one officers were killed with guns last year. The largest, annual number of police officers shot and killed nationally in the past ten years was 70, who were killed in 2007, according to the memorial fund website.

Most significantly, the number of ambushes of police this year has already exceeded the number from last year.  Generally, someone who ambushes police is assumed to have planned the attack in advance.  In this sense, the Dallas attack is one more indication that police have a bullseye on their backs and that incidents targeting them are becoming more common.