Multiple outlets report that 20 to 30 workers are unaccounted for after a Japanese earthquake followed by an explosion at a shopping mall. The reports say the incident involves a mall in Japan where the earthquake occurs first, damaging parts of the building and interrupting operations. After the quake, an explosion is reported inside the mall, further affecting the structure and raising concerns for people working on-site at the time. Authorities are described as attempting to account for workers and assess damage and possible injuries, while media coverage cites the missing number reported for mall workers. The exact location of the mall, the cause of the explosion, and the details of casualties are not provided in the supplied summaries. The reports indicate that the status of those missing has not been conclusively resolved and that efforts continue to determine what happened to the workers following the quake and blast.