Much of Monday’s gain was lost as the day wore on and investors cashed in on profits.

NEW YORK (AP) – Stocks jumped as U.S.-led troops swept into Baghdad and seized a presidential palace Monday, giving investors hope for a swift end to the war. But a burst of late-day profit-taking left stocks just modestly higher.

Analysts said the developments prompted some investor bets that a victory would come in a matter of weeks rather than months. Better-than-expected profits from Alcoa also provided a boost, lifting the Dow Jones industrials as much as 243 points before they lost momentum.

“The thought is the situation in Iraq is moving at a rapid pace now,” said Michael Palazzi, managing director of equity trading at SG Cowen Securities. “As the headlines read over the weekend, it looks like the outcome is inevitable.”

The Dow closed up 23.26, or 0.3 percent, at 8,300.41, having gained 1.6 percent in the previous week.

The broader market also finished higher. The Nasdaq composite index rose 6.00, or 0.4 percent, to 1,389.51, following a weekly advance of 1 percent. The Standard & Poor’s 500 index gained 1.08, or 0.1 percent to 879.93, after rising 1.8 percent last week.

On Monday, U.S.-led forces stormed into Baghdad, taking control of Saddam Hussein’s New Presidential Palace. British officials also said Ali Hassan al-Majid, referred to as “Chemical Ali” for ordering a poison gas attack that wiped out thousands of Kurds, was killed in a weekend airstrike.

Stocks have fluctuated in recent days as investors focus on the latest developments from Iraq and make bets on how long the war will last. Analysts say traders are generally optimistic about a short war, although they have been quick to sell on signs of a protracted conflict.

Indeed, most shares Monday hit their peak in the first hour of trading before gradually losing much of their gains as investors cashed in profits.

“We had a gut reaction move up on strong overseas market gains and the good weekend news,” said Tony Cecin, director of institutional trading at US Bancorp Piper Jaffray. “When investors ran them up over a couple hundred points, many decided it was probably too much, too soon.”

John Lynch, chief market analyst at Evergreen Investments, said many investors are counting on the 21/2-week-old war to conclude within four to eight weeks. If that happens, the market should push even higher, he said, citing strengthening economic conditions.

But “if the war extends beyond two months, we risk higher oil prices crimping growth and that becomes a more negative scenario,” Lynch said.

Dow component Alcoa jumped $1.59, or 7.9 percent, to $21.63, after the world’s largest aluminum producer reported quarterly operating earnings Friday that beat analysts’ estimates by 4 cents per share.

AOL Time Warner climbed 61 cents to $12.16 after Morgan Stanley boosted the media company’s stock rating to “overweight” from “equal-weight.”

Siebel Systems rose 24 cents to $7.99 even though the technology company warned that its first-quarter profits would fall short of Wall Street’s expectations.

Decliners included InFocus, which dropped 38 cents to $4.26, after the maker of visual projectors said its first-quarter profits would fall below analysts’ estimates, citing a slowdown in technology spending.

Advancing issues outnumbered decliners 9 to 5 on the New York Stock Exchange. Volume was light at 1.46 billion shares, but higher than the 1.24 billion traded Friday.

The Russell 2000 index, a barometer of smaller company stocks, rose 3.29, or 0.9 percent, to 376.57.

Overseas, Japan’s Nikkei stock average finished 2.2 percent higher Monday. In Europe, France’s CAC-40 rose 3.4 percent, Britain’s FTSE 100 advanced 3.2 percent and Germany’s DAX index climbed 5.8 percent.

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On the Net:

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AP-ES-04-07-03 1700EDT