Secondary explosions ( and/or fires ) reported (on MSNBC shortly before Chris Jansing took over coverage at 4PM EST) at the JFK Library and another undisclosed location.

Footage of black fumes from (allegedly) the JFK Library has been briefly shown before cutting back to the coverage of the main explosion at the Boston marathon.

The fire at the library has been initially reported to have been controlled. No casualties or injuries have been reported.

A curious mention of "manuscripts" (not being damaged) has been reported (on MSNBC) as well.

CNN is yet to report any such secondary explosions as of the current time (4:10 PM EST).

CNN has also not shown any footage of black fumes from a different location.

The fumes at the Boston marathon explosions were distinctly white in color.