The arrests highlight the latest strategic shift by Mexican drug barons, who have graduated from transporting cocaine and heroin for the Colombians to distributing the drugs themselves.

The arrest of the children highlighted a rise in killings committed by Canadian youths.

But to Ms. Pirro and other public officials, the arrest highlighted the need for more aggressive screening of teaching applicants.

His arrest highlighted the quandary facing European nations like Britain, where laws offering sanctuary to seekers of political asylum are seen by American investigators as sheltering fugitives from justice.

Such incidents have heightened tensions, and the general's arrest has highlighted divisions that have endured since he gave up the presidency in 1990.

The arrest highlighted the government's increased sensitivity to criticism.

The arrest of a foster parent in an abuse case, while uncommon, also highlights the rarely publicized concerns of the biological parents of foster children.

The arrest of the rabbi, Israel Shemtov, 49 years old, and his son Mendel, 22, highlighted racial tensions in a area where the police said there had been many clashes between blacks and Jews.

Nevertheless, his arrest has highlighted divisions that have endured since he gave up the presidency in 1990.