If you haven’t hatched eggs for a while now in Pokemon GO, please be advised that strange phenomenon is happening right now in the game which affects the 7 km egg hatching.
According to the official announcement, fossil Pokemon will be hatching from 7 km eggs for a limited time. Niantic did not reveal when will this fossil egg hatch will last, so make sure to take advantage of this event before it disappears.
Fossil Pokemon from 7 KM Eggs
As of writing, here are the confirmed hatched from the 7 km eggs:
Meanwhile, Riolu has also been reported to be hatching from 10 km eggs. The event did not clarify what happened to the Pokemon that are hatching, but I guess that they have been temporarily halted while the fossil Pokemon event is on going.