War Brewing Between Ethiopia and Somalia's Islamic Courts Union?

"Since capturing Mogadishu last month, the Islamic Courts Union (ICU) in Somalia has moved in an increasingly radical direction. This is reflected both in their leadership choices and also their implementation of Taliban-like Islamic law. Beyond that, the ICU is aggressively expanding its power. It recently surrounded the southern Somali city of Baidoa, where the largely powerless interim Somali government is holed up.
On Monday, Time's website reported Ethiopia's concerns over the ICU's stance toward Baidoa:

The Islamic Courts Union says it will not attack the interim government, which is mostly secular in outlook, but the government’s closest ally, Ethiopia, is worried enough to be massing troops to take on the Islamic forces itself. The Islamists and Somali journalists say that Ethiopia has already sent troops over the border, a claim Ethiopia denies. But there is no doubting Ethiopia's intentions. “We will use all means at our disposal to crush the Islamist group if they attempt to attack Baidoa,” Ethiopian Information Minister Berhan Hailu told Reuters in Addis Ababa, Ethiopia’s capital.

Just as Ethiopia has threatened to use military force against the ICU, the ICU has vowed to attack the Ethiopian soldiers that it claims have crossed the border into Somalia. (Although Ethiopia denies this, eyewitness accounts makes it appear that the ICU is correct that there are Ethiopian soldiers in Somalia.)"
Counterterrorism Blog

The plot thickens