The credit crisis on Friday engulfed one of Wall Street’s most important investment banks as the Federal Reserve and JPMorgan Chase combined to provide emergency finance for 85-year-old Bear Stearns and prevent further upheaval in global markets.

The decision by the monetary authorities to throw a temporary lifeline to Bear followed a night of deliberations involving regulators, led by Timothy Geithner, president of the New York Fed, and came after Bear’s shares plunged and its access to overnight funding dramatically diminished. It is likely to pave the way for a sale or liquidation of the company in the coming weeks. However, people close to the situation said Bear was also talking to strategic investors about a capital injection.