February 22, 2015 11:50 pm Manhole Explosion in Center City Carbon Monoxide was detected inside several buildings Sunday after underground explosions caused smoke to rise from a manhole in a Center City street. NBC10’s Doug Shimell has the details. US & World Videos 2:03 Members of the Jewish community gathered in honor of Holocaust Remembrance Day 0:23 New Jersey State Trooper died during training, officials say 1:32 More than 100 residents displaced after a fire at an apartment building in West Philly 0:17 Man in critical condition after being shot several times inside a seafood restaurant 0:20 Man in critical condition after being shot inside an apartment building in West Philly