'The Daily News carried an article about some local teenagers arrested for drug possession. Teenagers these days are nothing but a bunch of junkies.' Which fallacy is committed?

A sweeping claim about all teenagers is drawn from one small report.

A single news item about a few arrested teens is the only evidence.

From that narrow instance the argument leaps to every teenager today.

A sample this thin cannot support a claim about the whole group.

Generalising from too few cases is hasty generalization.