WASHINGTON (AFP) - Former US Treasury secretary Larry Summers said Sunday it was too early to declare the financial markets crisis over and said chances had risen sharply of an economic downturn in the United States. ADVERTISEMENT Despite interventions by the US Federal Reserve last week which appeared to reverse heavy selling pressure over the collapsing US housing debt market, Summers said the risk of recession was its highest since the immediate aftermath of the September 11, 2001 attacks. "We certainly saw some repair and some return to normality this week, but I think it would be far premature to...