(Reuters) – Insurer American International Group Inc reported a nearly 17% rise in quarterly profit on Tuesday that topped market estimates, as strong underwriting gains and lower catastrophe losses cushioned a drop in investment income. The company – one of the world’s biggest commercial insurers – said gross premiums written in its general insurance business rose 7% in the first three months of the year to $11.51 billion. The strong results come at a time when the insurance industry is facing hefty claims from the months-long war in Ukraine that has sparked wide-ranging sanctions. AIG, whose…