responsibility
No one has yet claimed responsibility for the attack.
The rebels claimed responsibility and vowed to carry out further attacks.
Police said that they had not been contacted by anyone claiming responsibility for the kidnapping.
No group claimed responsibility, but the police have arrested several suspects.

SMART Vocabulary: related words and phrases

Assertions & asserting
affirm
affirmation
airing
assert
assert your right
assertion
beg
emphatic
gaslight
hate speech
lay something on the lineidiom
maintain
plead
pretend
reaffirm
rooftop
self-affirmation
send
send a messageidiom
set yourself up as something