NAIROBI, (Reuters) – Kenya’s attorney general Amos  Wako was the senior government official handed a travel ban by  Washington last month, the US envoy to Kenya said yesterday.

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.

US 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, US 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 US for obstructing reforms? The answer is:”

The front page of the Standard read: “US ban: It’s Wako.”

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.

Announcing the ban, Carson said the official in question had  been “obstructive in the fight against corruption”.

Watchdog Transparency International ranks Kenya as the most  corrupt nation in east Africa.

While President Mwai Kibaki has yet to respond to the US  ban, Foreign Minister Moses Wetangula said on Wednesday Kenya  regretted that Carson had arrived uninvited and then made  “fairly unacceptable and reckless statements”.