A manhole exploded near 113 East 39th Street around 4:25 a.m. Five buildings were evacuated, but no injuries were reported. The FDNY found high carbon monoxide levels near the building, and residents may be out of their homes for many hours. It's unclear what caused the explosion, but they are not uncommon. Of course, this incident took place just blocks from where a steam pipe exploded last year, killing one woman, critically injuring two people,......