Police arrested him at his home -- a breach with an unwritten rule in Pakistan that ex-generals are above the law. The ex-paratrooper is accused of overstepped his powers in a showdown with the judiciary in 2007 when he sacked the chief justice and placed judges under house arrest.
http://www.reuters.com/article/2013/04/20/us-pakistan-musharraf-idUSBRE93I04K20130420
Pakistan was suspended from the Commonwealth, a grouping centered around Britain and its former colonies, in November following Musharraf's imposition of emergency rule and the detention of thousands of opposition activists.
http://www.independent.co.uk/news/world/politics/pakistan-rejoins-commonwealth-827109.html
How much influence does the Commonwealth have over Pakistan and Musharraf?