The space weather report website Spaceweather.com is reporting that comet ISON seems to have disintegrated when it passed close to the sun. There are now clues that some small part of the comet might have survived the passage, but it is minor and is unlikely to provide any type of tail as it did before it did go past the sun.
For images and more details please click on the following link.
News about the comet destruction (or close to it)
Comet Ison destroyed in Sun passage (BBC News)