cautioning

"There are voices cautioning: 'Are we really on the right track? Is our threat perception right?'"

When Noland's implant was announced, experts hailed it as a "significant milestone", while also cautioning that it would take time to really assess - especially given Musk's adeptness at "generating publicity for his company."

Mid-afternoon is easily the quietest time during our 24 hours at the Royal Free, with some of the ambulance staff we come across cautioning that things will change as day turns to night.

Environmental Protection Agency also released a statement cautioning against claims made about the the effectiveness of air filters using ionization to protect people from COVID-19.

Although recent air-quality index readings would appear to be safe, officials are cautioning that some wildfire ash is too large to be detected by their instruments and will not be captured by air monitors.