Brent crude prices
fell to 16-month low, below $98 a barrel, on Monday, pressured by fears of a global economic slowdown following weak US and Chinese economic data.
Brent crude for July delivery dropped more than $1 to an intraday low of $97.06, the lowest since January 2011.
US crude fell $1.44 to $81.79 a barrel after tumbling to as low as $81.59 earlier in the session, the lowest since October 2011.
Data on Friday showed
US job growth stumbling in May, causing the country's unemployment rate to rise for the first time in nearly a year. China also added to the gloom, reporting a slowdown in the country's manufacturing sector.
Traders are closely watching several monetary policy meetings due this week, including the European Central Bank on Wednesday and Bank of England on Thursday, for clues on their responses to vulnerable global growth.
US Federal Reserve Chairman Ben Bernanke on Thursday will testify before a congressional committee about the state of the US economy.
with inputs from agencies 
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