Amazon reports a loss of $57m in the first quarter and also said its web services business generated sales of $1.57bn.

US technology giant Google reports a 4% increase in profits in the first quarter to $3.59bn helped by strong advertising sales.

Microsoft reports a 12% fall in profits to almost $5bn in the first three months of 2015, but sales rise to $21.7bn, cheering investors.

A government adviser warns that a new hi-tech rail signalling system could be hacked by terrorists to cause train crashes.

An Australian "wellness" blogger who built a successful business on claims she survived terminal cancer admits she lied about having the disease.

Police guarding London airports will start using drones for surveillance following a review by counter-terrorism officers.

The falling value of bitcoins is making the virtual cash much less attractive to cyber-thieves, claims a security expert.

The woman who challenged sexism in Silicon Valley now faces a $1m legal bill unless she agrees not to appeal.