The suspect in the attack in Germany had history of threats and harassment though no record of violence and an ideology that didn’t fit familiar patterns.

After an assailant driving an S.U.V. killed five people, calls for solidarity have quickly given way to criticism by rival lawmakers, ahead of snap elections set for February.

Mourners laid flowers near the scene of the deadly Christmas market attack on Monday as investigators puzzled over the motive of the suspect and his previous encounters with authorities were scrutinized,