1. What are scare quotes?

2. What type of bias does Reuters display with the use of scare quotes in the article's headline?

3.  In addition to the biased headline, Reuters reports in para. 7:  "The trio, in their late 20s and early 30s, say they were hiking in the mountains of northern Iraq and, if they crossed the unmarked border into Iran, it was by mistake."  Why do you think Reuters, a respected news agency, is implying that they are unsure if the Americans are telling the truth?
(Read a previous post about Reuters use of scare quotes when referring to the hikers.)