Police tightened security in an upscale Baghdad neighborhood Friday as the search intensified for two Algerian diplomats kidnapped there. At least 16 people died in attacks in Baghdad and elsewhere. More police were on the streets and motorists reported extra checkpoints Friday in the western Baghdad neighborhood of Mansour, where top Algerian envoy Ali Belaroussi, 62, and fellow Algerian diplomat, Azzedine Belkadi, 47, were seized the day before. They were not traveling with bodyguards, officials said.The kidnappings brought to five the number of key diplomats from Islamic countries targeted in Baghdad in less than three weeks in an attempt to undermine support for the Iraqi government among Arab and Muslim nations. Police officials said they suspected the diplomats and their kidnappers may still be in the Mansour area because witnesses reported the abduction too quickly for the gunmen to have gone far.