Kanye West was under observation at a Los Angeles-area hospital late Monday after he abruptly canceled the remaining dates of his national tour, multiple sources familiar with the case told NBC News.

The admission followed a week of bizarre incidents during which the provocative rapper publicly railed against fellow music stars Beyoncé and Jay Z and retroactively endorsed President-elect Donald Trump.

A source familiar with the case said Los Angeles police responded to a medical welfare call about 1:20 p.m. No criminal activity was involved; the decision to hospitalize West was for his own health and safety, the sources said.

West's concert promoter, Live Nation, said earlier in the day that the remaining dates of his Saint Pablo Tour had been called off. No reason was given.