AMSTERDAM — Investigators took detailed photos of the wreckage of a Turkish Airlines Boeing 737 and analyzed black box recordings today, trying to piece together why the plane lost speed and plowed into a muddy field, killing nine people and injuring 86.

Flight TK1951 from Istanbul fell out of the sky about two miles short of the runway at Amsterdam's Schiphol Airport on Wednesday morning, smashing into three pieces and spraying luggage and debris across a farmer's field. It was carrying 134 passengers and crew.

Despite the catastrophic impact, the wreckage did not burn and a good number of people walked away with only minor injuries.

The passengers and crew came from at least nine different countries, including seven Americans and three Britons, mayor Theo Weterings told reporters.

Most passengers were Dutch and Turkish, but one person each came from Germany, Taiwan, Finland, Bulgaria and Italy. Weterings said the nationalities of 15 of the passengers still had not been confirmed. Four of the Americans were Boeing employees.

He said 121 people were treated for injuries and six were still in critical condition. Of the others, an airport official said earlier that 25 were considered seriously hurt.

Weterings said investigators were not yet revealing any details of their probe into the cause of the deadly crash.

A spokesman for the Dutch Safety Authority said the data recorders were sent to Paris, to be analyzed.