NEW YORK (CBSNewYork) — The NYPD is asking for the public’s help to find individuals accused of intentionally trying to injure officers.

Chief of Detectives Rodney Harrison tweeted out a video showing a string of recent attacks on officers over the last few weeks.

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Police say the ambushed officers were left bloodied and bruised.

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In one incident, officers were struck by flying objects.

In another, police say an officer was hit with a metal chair.

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Anyone who has information regarding these incidents is asked to call the NYPD’s Crime Stoppers Hotline at 1-800-577-8477 or for Spanish, 1-888-577-4782. Tips can also be sent to the NYPDTips Twitter account or submitted online at NYPDCrimeStoppers.com.