The Securities and Exchange Commission filed a civil fraud suit on Friday that essentially says that Goldman built the financial equivalent of a time bomb and then sold it to unwitting investors. Mr. Egol, 40, was not named in the S.E.C.’s suit.

Goldman has vowed to fight the S.E.C. But the allegations have left many on Wall Street wondering how far the investigation might spread inside Goldman and perhaps beyond.

Pressure on Goldman mounted on Sunday as two members of Congress and Gordon Brown, Britain’s prime minister, called for investigations into the bank’s role in the mortgage market. Germany also said it was considering legal action against the bank.

Mr. Tourre was the only person named in the S.E.C. suit. But according to interviews with eight former Goldman employees, senior bank executives played a pivotal role in overseeing the mortgage unit just as the housing market began to go south. These people spoke on the condition that they not be named so as not to jeopardize business relationships or to anger executives at Goldman, viewed as the most powerful bank on Wall Street.

According to these people, executives up to and including Lloyd C. Blankfein, the chairman and chief executive, took an active role in overseeing the mortgage unit as the tremors in the housing market began to reverberate through the nation’s economy. It was Goldman’s top leadership, these people say, that finally ended the dispute on the mortgage desk by siding with those who, like Mr. Tourre and Mr. Egol, believed home prices would decline.