It is not your imagination. The numbers have elevated. Police being killed by an ambush are up 167% this year after two more were added to the tally with the assassinations in Iowa this week reported USA Today.

This matches the deadliest year for these attacks. Sadly we only need to go back to 2014, when 16 ambush-style killings occurred. In total, there have been 40 officers shot and killed by ambush since 2014, said Steve Groeninger, spokesman for the National Law Enforcement Officers Memorial Fund.

To date, 115 officers have died in the line of duty in 2016. Of those deaths, 52 were killed by gunfire, a 58% increase.

This is the deadliest year for officers being murdered since 2011.

“All of these tragedies remind us in very stark terms that America’s law enforcement professional are facing clear and growing dangers on our behalf. And, when our police officers are at risk, we are all at risk,” Groeninger said.

On average, one law enforcement officer is killed in the line of duty somewhere in the United States every 61 hours. Since the first known line-of-duty death in 1791, more than 20,000 U.S. law enforcement officers have made the ultimate sacrifice.