Korean Catholics and anti-US beef protesters march on a street in front of the headquarters of the Bank of Korea, South Korea's central bank, after a mass prayer as part of protests demanding the full-scale renegotiation of the US beef import deal in Seoul July 1, 2008. South Korea's prime minister said on Tuesday that violent street rallies against a US beef import deal are harming the country's international credibility and driving investors away. [Agencies]