March 29 Sierra Metals Inc
* Sierra Metals Inc. announces resignation of president and CEO
* Sierra Metals Inc - Mark Brennan has tendered his resignation as president and chief executive officer.
* Sierra Metals Inc - Brennan will continue in his current role for a period of 30 days to facilitate implementation of an orderly succession plan
* Sierra Metals Inc - Brennan also resigned as director of company effective immediately Source text for Eikon: Further company coverage:
BA cancels flights from London's Heathrow, Gatwick after IT outage
LONDON, May 27 British Airways said it had cancelled all flights from London's Heathrow and Gatwick airports scheduled before 1700 GMT on Saturday due to a global computer outage.