pilots. joe johns is here. he's been digging into their background. >> we are learning bits and pieces about the lives of the pilots. for example, the captain of the 777 has been called a silent member of a malaysian opposition political party, but so far no signs pointing to malicious intent in the cockpit. surveillance video posted on social media appears to show the captain and first officer of flight 370 passing through airport security. cnn cannot confirm the authenticity of this video or exactly when it was shot. it doesn't show the men doing anything unusual, but the two are now facing intense scrutiny by investigators. >> on sunday night march, police officers visited the homes of the pilot and the co-pilot. they spoke to the family members of the pilot and co-pilot. police visited the homes of the pilot and co-pilot again on saturday. >> reporter: police have now searched the homes of both.