SINGAPORE (AFX-ASIA) - The yen was higher in quiet midmorning trading here as investors shifted to what was considered a safer currency than the regional units in the wake of the US attacks on Afghanistan, dealers said. "The yen is quite stable compared to other regional currencies which are under pressure because of the rupiah weakness ... the yen is considered a safer currency," a dealer with a local bank said. He said the rupiah has weakened sharply amid concern the US attacks on Afghanistan could trigger violent reactions among Indonesians.