All of the suspects taken into custody are Muslim, which today prompted Muslim leaders in Britain to write an open letter to Prime Minister Tony Blair.

NPR: British Stance in Iraq Tied to Airline Bomb Plot

That prompted the Chinese technology giant to write an open letter to the US authorities earlier this year asking them to conduct a probe into its operations and settle the issues.

BBC: Huawei products

Mervyn King, the governor of the Bank of England, had to write an open letter to the chancellor this week to explain why consumer-price inflation had diverged so far from the 2% target, reaching 3.5% in the year to January.

ECONOMIST: Why there are renewed worries about unemployment