US ambassador to Pakistan Anne W Patterson will lead a 12-member delegation of leading Pakistani businessmen to America in first week of next month for exploring more investment opportunities in energy and other sectors. Pakistan has much more positive investment friendly atmosphere what people think and many US investors are ready to invest here in different sectors especially energy, said the US ambassador Anne W. Patterson while talking to a group of journalists here at US embassy along with Chairman Board of Investment Saleem Mandviwalla. The US ambassador said despite some security problems, America is still the largest single country in the foreign direct investment and over 60 companies are investing in different sectors.