Police arrested two men from Rotterdam, ages 18 and 22, last evening and overnight after a 17-year-old boy from Rotterdam was stabbed and shots were fired Saturday evening in the Delfshaven district, police reported Sunday.The stabbing happened around 8:30 p.m. on Claes de Vrieselaan. The victim was taken to a hospital.Police confirmed a firearm was used and gunshots were heard in the area at the time of the incident. It is not known whether the weapon was found.