.... Does this institutional investors manipulating the price or traders is just using there news as a negative signal?
It's more like selling on the news which is a normal market reaction. There are still uncertainties with the Russia-Ukraine conflict that's affecting the global market so expect more people to quickly take profit when there's an opportunity even if it's just 10% or less.
One of those reasons or factors on Bitcoin sharply declined or, just a coincidence.
The market behavior was always like this and besides, we're still lucky because the market pumped for about 4 days and then the correction has occurred, together with the news of Microstrategy which also contribute to dragging down the price too much. But now, look at the market, it seems it will resist and the price will increase again.
Whatever reason, don't look at the market by hours or by day, it makes you frustrated and results in panic selling, just aim for long-term holding while at the same time making a profit.