The threat to life and property in the Twin Cities continues. Consider this: Law enforcement and Minneapolis residents were on high alert into the early hours, even though ominous warnings about a new wave of arson attacks had not materialized as of the early hours of Monday. Earlier Sunday, state officials said several caches of flammable materials were found both in neighborhoods where there have already been fires and “in cars we’ve stopped as recently as this morning,” said John Harrington, state public safety commissioner. Some of the caches look like they may have been planted days ago and some...