Published: May 10, 2010 1:47 AM EDT

NEW YORK (AP) - Federal investigators say no engine alarms sounded on a New York City ferry before it crashed into a pier, injuring dozens of people.

National Transportation Safety Board member Robert Sumwalt says investigators have interviewed the Staten Island ferry's chief engineer and some of the crew members and have met with the ferry's management. He says they aren't ruling anything out as they try to determine what caused the ferry to malfunction Saturday.

The NTSB team completed its first full day of work on the investigation Sunday. It will spend as much as a week collecting information and evidence surrounding the accident.

Alcohol test results have come back negative. Drug tests are being evaluated.

The ferry that crashed also was involved in a 2003 wreck that killed 11 people.