Irish rappers Kneecap have denied supporting Hamas and Hezbollah and apologized to the families of two slain U.K. lawmakers after remarks that sparked anger.

The Irish rap group Kneecap denounced Hamas and Hezbollah after Micheál Martin, the Irish prime minister, called on them to “urgently clarify” their stances. The group is from Belfast, the capital of Northern Ireland in the United Kingdom, and U.K. police have also announced that they are investigating the group.

Belfast trio Kneecap has apologised to the families of murdered British MPs Sir David Amess and Jo Cox for historic comments made on stage.