ashish jha says the subvariant could likely be more contagious than other strains but still it is unclearous. >>> amazon announced yesterday that it will be cutting about 18,000 positions it's the largest set of layoffs in the company's history the cuts will mainly hit the company's corporate workforce and brick and mortar stores, and will not affect those hourly warehouse workers. amazon's ceo says the layoffs were set off by the uncertain economy and the company's rapid hiring over the last several years. >>> let's turn now to breaking news overnight, in a case that has been closely watched, the accused killer of the four college students in idaho is now back in that state to face charges. >> and this morning, new details are emerging about the evidence police have gathered in this case nbc's gadi schwartz is in moscow, idaho, with more gadi, good morning. >> reporter: good morning, hoda. the next few hours, we expect to see the charging documents against bryan kohberger, the suspect in this case, finally unsealed, and they should shed light on exactly why police think he is the killer