The young teen was stabbed in his midsection around 9 a.m. when a fight broke out at East 163rd Street and Grand Concourse in Concourse Village, police said. 

He went on to randomly strike a 34-year-old man just outside the 73-story skyscraper at the corner of East 42nd Street and Vanderbilt Avenue – before storming inside the lobby of the iconic building and dealing another blow to a 23-year-old man, the sources said. 

Liam Delemo was stabbed around 10:25 p.m. when a fight broke out just outside the private house in West Babylon, where between 90 and 100 teens gathered for the bash, Suffolk County Police said. 

Alleged violent suspect Frank Fernandez, 64, tried to get into the bathroom at the Church of St. Catherine of Siena on East 68th Street around 6:45 p.m. Saturday when the 63-year-old volunteer told him he couldn’t use it, cops and prosecutors said.

The suspect allegedly doused the 19th century oil-on-canvas “Princesse de Broglie,” by French portraitist Jean Auguste Dominique Ingres — hailed as a “masterpiece’’ by the Met on its Web site — in a 4:50 p.m. frenzy Monday inside the iconic Fifth Avenue museum in Manhattan.

A 20-year-old – enrolled in the NYPD’s paid internship program for college students – was sitting in his car with his 22-year-old gal pal on West 25th Street near Seventh Avenue around 3:45 a.m., when two men ran up on them holding guns, authorities said.