Reuters – All U.S. stocks will probably be subject to so-called circuit breakers by the end of this year, Duncan Niederauer, chief executive officer of stock exchange operator NYSE Euronext, said on Thursday.

Reuters – Frustrated lawmakers pressed regulators to move faster to pinpoint the cause of the mysterious May 6 market crash, with two weeks of investigation producing few answers.

AP – World markets fell sharply once again Thursday as sentiment continued to be hit by concerns about the continent’s debt crisis and figures showed an unexpected increase in U.S. jobless claims last week. The worries left most of the world’s leading indexes now trading below where they started 2010.

AFP – London shares sank by more than 3.0 percent in late afternoon trade on Thursday, as investors responded to rising US jobless claims and stubborn fears about the eurozone debt crisis.

AFP – London shares closed lower on Thursday in a global sell-off sparked by weak US jobs data and concerns the European debt crisis could undercut economic recovery.

AP – A look at economic developments and activity in major stock markets around the world Thursday:

AFP – US stocks slumped Wednesday on European debt and US unemployment concerns as well as fears that the American recovery could be losing steam, with the blue-chip Dow index tumbling more than 300 points.

AP – Stocks plunged again Thursday as more investors woke up to the possibility that economic problems such as Europe’s debt crisis might spread around the world and stop the growing recovery in the U.S.

Reuters – Stocks dropped on Thursday, driving indexes down more than 2 percent on growing fears that the euro zone’s handling of its sovereign debt crisis could jeopardize the global economic recovery.

AFP – London’s main stock markets pulled lower early Thursday, having already plunged the previous day after Germany introduced a ban on so-called naked short-selling.