Oil prices slipped in the international market on Tuesday, as investors shrugged off the supply concerns over tensions in Libya. Brent crude LCOc1 dipped down 0.5%, to $64.90 per barrel. US WTI crude futures CLc1 were traded 0.2% lower, at $58.40 a barrel. Libya's state-run National Oil Corporation (NOC) is said to have declared force majeure on crude loadings from El Sharara and El Feel oilfields in Libya’s southwest.