ISIS has claimed responsibility for the explosion on a train that hospitalized at least 29 this morning in London, reports Axios' Alayna Treene. Quick updates:
Photos from the scene reveal a fire inside a shopping bag in a white bucket inside a train cart. One passenger told the UK's Press Association he heard a "boom and when I looked there were flames all around."
Police said the improvised explosive device did not fully explode, but was meant to explode further.
Bottom line: This marks the fifth major terrorist attack in the U.K. this year.