DuckDuckGo [https://duckduckgo.com]:

"No results. Try:" + Search suggestions + Instant answers

Bing [https://www.bing.com/]:

"It's not you, it's us.

Bing isn't available right now, but everything should be back to normal very soon."

EDIT: DuckDuckGo statement: https://twitter.com/duckduckgo/status/897497301106663425