Nearly 90 percent of U.S. journalists in Iraq say much of Baghdad is still too dangerous to visit, despite a recent drop in violence attributed to the build-up of U.S. forces, a poll released on Wednesday said.

The survey by the Washington-based Pew Research Center showed that many U.S. journalists believe coverage has painted too rosy a picture of the conflict.

A separate Pew poll released on Tuesday showed that 48 percent of Americans believe the U.S. military effort in Iraq is going very or fairly well, up from 34 percent in June, amid signs of declining Iraqi civilian casualties and progress against Islamist militants such as al Qaeda in Iraq.

But most journalists said they believe violence and the threat of violence have increased during their tenures.

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The journalists gave high marks to the overall reporting effort, with 74 percent rating news-gathering as good or excellent. The highest marks went to coverage of U.S. troops and the war against insurgents.

Despite claims by U.S. officials that reporting from Iraq is negatively biased, 70 percent of those surveyed believe overall coverage is accurate, while 15 percent say the coverage makes the situation look better than it is.

Forty-four percent of journalists believe reporting has treated the Bush administration fairly, while 43 percent said coverage has been too easy on U.S. officials.

But the data also showed that 67 percent are at least somewhat concerned that the accuracy and completeness of their reports have suffered because of ongoing security problems that limit their access to the country.

President George W. Bush's so-called surge strategy to stabilize Baghdad and its environs has been credited with a fall-off in attacks on Iraqi civilians and U.S. coalition forces over the past two months.

But 87 percent of respondents said at least half of Baghdad remains too dangerous for a Western journalist to visit, with the capital's Shi'ite-dominated Sadr City enclave rated the most dangerous spot in Iraq. Eighteen percent said the entire city of Baghdad is too dangerous for travel.

Most U.S. journalists have traveled to danger spots such as Sadr City, either under the protection of private security guards or the U.S. military.

"Eight in 10 journalists believe conditions have deteriorated for reporters since their own first posting in the country," the survey's authors said.