Kenya's attorney general Amos Wako was the senior government official handed a travel ban by Washington last month, the U.S. envoy has said to Kenya.

There has been intense speculation in Kenya over who had been banned, with Wako high on most lists given that Washington has criticised him several times for not cracking down on corruption during his 18-year tenure.

Ending a culture of impunity in a country where corruption is almost endemic is seen by international donors has a crucial step towards avoiding a repeat of last year's post-election violence at the next presidential election in 2012.

U.S. Assistant Secretary of State Johnnie Carson announced the travel ban during a visit to Kenya last month and said Washington was considering similar action against three more prominent Kenyans. But he declined to name the official.

Ending the speculation, U.S. ambassador Michael Ranneberger directed readers of his Twitter page to The Standard newspaper, saying: "Still wondering which senior Kenyan official has been banned from the U.S. for obstructing reforms?  The answer is:" The front page of the Standard read: "U.S. ban: It's Wako."

Source: Reuters

Wako has been criticised for failing to prosecute the perpetrators of the post-election violence that killed at least 1,300 people, and for not nailing the architects of several audacious corruption scams worth hundreds of millions of dollars.