Updated with exact claims from Engadget below:

You were wondering why Google was hesitant to put multi-touch on those HTC Android handsets in the US?  

Apple’s lawyers.  

Today Apple announced they were suing HTC for infringing on 20 Apple patents related to the iPhone’s user interface, underlying architecture and hardware.   Google wasn’t mentioned but this is just the latest (and biggest) escalation of the battle of Silicon Valley behemoths. 

Steve Jobs said: