Goldman Sachs has been fined $22m by a US regulator for failing to prevent upcoming research from its analysts being passed on to its top clients.
The US Attorney General has filed a civil antitrust action against Apple and a number of publishers, accusing them of colluding to sell e-books for higher prices.
The FTSE 100 fell 50 points, or just under 0.9%, in early trading on Tuesday as investors got their first opportunity to act on a disappointing US jobs report on Friday.