I 've seen a few Hornets around here, but not sure if there Asian or just hornets
I'm sure I see these Asian hornets in my garden early this summer, I'm new to gardening and bees, so don't know to much, but I noticed these because they were attacking all the other bees! the way they flew around stalking the bees before attacking them was quite intimidating and horrible to see so I took it upon myself to regularly hose the buggers out of my garden! But I will be sure to take pics next year!
Are you in UK? They may be European hornets or even wasps which take weak bees.
If you do believe you have Asian hornets then this website will tell you where to report sightings. https://www.gov.uk/government/news/new-app-to-report-asian-hornet-sightings