Police in Allentown, Pennsylvania responded to a shooting that began when two groups opened fired at each other during an annual Dominican Festival on Sunday night.Allentown Police officers also opened fire in the incident, which happened at about 6:45 p.m. in the 100 block of North Seventh Street, Lehigh County District Attorney Gavin Holihan said, according to LehighValleyNews.com.Several people were wounded and transported to local hospitals."Right now it appears there are no fatalities and no Allentown police officers that were injured," Holihan told the outlet.PENNSYLVANIA FATHER HELPS FBI TRACK DOWN SCAMMING SUSPECTS WHO LED HIS SON TO SUICIDEAllentown Mayor Matt