Reuters | Oil prices slip after rally as market turns cautious Reuters Reports from Nigerian media that the government had signed a 30-day ceasefire with militants whose attacks have curtailed the country's crude oil exports also added a bearish signal to a market that firmed on the back of supply disruptions. Brent crude ... Oil Prices Fall on Brexit Fears and Supply Glut US oil ends 2.9% higher, at $49.37, as Brexit chances dim Oil Prices Rise as Global Stock Markets Surge |