How an Iranian business with close ties to the country's nuclear program obtained restricted equipment for enriching uranium is the focus of multiple investigations being conducted by western agencies. The Wall Street Journal reported Friday night that the International Atomic Energy Agency (IAEA) and western intelligence agencies have been probing the Iranian firm's procurement of "critical valves and vacuum gauges" since Jan. 14. The IAEA launched its investigation after receiving a tip that the equipment allegedly reached the Iranian business through a Chinese company's intermediary.