Bulgaria and Norway became new focal points on Thursday of a global hunt for who supplied Hezbollah with the thousands of pagers that exploded in Lebanon this week in a deadly blow to the militant group. Security sources said that Israel was responsible for the explosions on Tuesday that killed 12 people, injured more than 2,300 and raised the stakes in a growing conflict between the two sides. Israel has not directly commented on the attacks. How and with whose help the pager attack was carried out was not yet known, although so far there were possible leads in Taiwan, Hungary and Bulgaria. I…