Updating this again (sigh)...
14 Manhattan synagogues and Jewish centers, five in Queens and another two in Brooklyn — with two more upstate temples and one on Long Island.
And the non-profit New York Landmarks Conservancy. Not sure if NYLC is the museum mentioned or a different location (it's not a museum). Also not entirely sure why NYLC was threatened at all.
All threats were by e-mail.
The is a joint FBI/NYPD investigation ongoing.
...
Between Dec 8th, 2023 and mid-January, 2024 there were 1009 bomb threats to US synagogues nationwide.
That too is an ongoing FBI investigation. And almost certainly by the same culprits.