Reading more into the NYT article.

In this NYT article, they say 3 monkeys went missing and were quickly shot: [link to www.nytimes.com (secure)]

In this NYT article, they say 4 went missing: [link to www.nytimes.com (secure)]



From that article:
"The cynomolgus monkeys, which are often used in scientific research and can cost up to $10,000 each, had been on their way to a lab in Florida when the crash happened at about 3:20 p.m. on Route 54 near Interstate 80 in Montour County, about 150 miles northwest of Philadelphia, the State Police said."