Norway on Thursday summoned a US embassy official in Oslo for talks following revelations this week that the US spied on European leaders, including in Norway, from 2012-2014. "I'm pleased that the Americans clearly said that they changed their practices in 2014 when it comes to the monitoring of allies, and that they want to cooperate with us and others to chart what happened," Norwegian news agency NTB quoted Prime Minister Erna Solberg as saying. "We summoned the US embassy in Oslo today to follow up on this," she added. phy/po/kjl