In People v. Madera AKA Rivera, 189 AD2d 462 (1st Dept. 1993), police went to a location because of anonymous tip of a fight involving a knife. When police arrived at the location, there was no sign of disturbance or of the knife or any people matching the description. As the police approached to the defendant, he took off on foot and discarded a weapon less than a minute after the chase. The court determined in this case that suppression was warranted because prior to the pursuit police did not have the requisite suspicion that criminal activity was afoot.