Turkey Promises to Take 'Necessary' Action After Downing of a Jet by Syria.

CAIRO -- Turkey's president said Saturday that his country would do ''whatever is necessary'' in response to the downing of a Turkish military jet by Syria, adding a new complication to the tense relationship between the former allies split by Turkey's support for Syrian rebels trying to overthrow the government. ''It is not possible to cover over a thing like this,'' said President Abdullah Gul of Turkey, according to the Anatolia news agency. ''Whatever is necessary will no doubt be done.'' [ABSTRACT FROM AUTHOR]