Police in U.K. issue warning about 'Momo Challenge' urging kids to self-harm

Police in the U.K. are warning parents about online videos that direct children to harm themselves and threaten them with severe consequences if their instructions are not followed. The warning was issued Monday by the Police Service of Northern Ireland (PSNI), which said it was working with other U.K. policing agencies to determine “the extent of the problem” posed by the Momo Challenge. The challenge, as described by the PSNI, involves messages being hidden in seemingly child-frien