Event:
Tension increases for New York City police after a man kills two officers to avenge the killing of two unarmed black men by police in recent weeks; police have been ordered to work in pairs and to consider their own safety first while on patrol
More Notable Events on December 22:
1990 Iraq announces it will never give up Kuwait
1990 Lech Walesa sworn in as Poland's 1st popularly elected president
1963 Official 30-day mourning period for President John F. Kennedy ends
1962 1,000,000th NBA point scored
1937 Lincoln Tunnel, in New York City, opens to traffic
