By Karen Johnson      Here are a few of the stories we’re
reading early Wednesday.      Authorities investigating the
Boston Marathon blasts that killed three and injured more than
175 have begun piecing together clues.      The Bank of Canada
is widely expected to hold its key interest rate steady at 1%
once again on Wednesday. What’s less clear is whether Canada’s
central bank will stop warning altogether about future rate
hikes.      SNC-Lavalin , seeking to protect its reputation,
sent an open letter to Algerian media, saying that it is
cooperating with authorities in several countries that have
opened investigations into its business.      London paused
Wednesday for the funeral for former British Prime Minister
Margaret Thatcher, an elaborate ceremony at St. Paul’s Cathedral
attended by Queen Elizabeth II and a who’s who of British public
officials, past and present.      The governments of the five
countries with Arctic coastline are working to forge an
agreement to regulate commercial fishing near the