critical condition in between surgeries, mika offered a thumbs-up to his family. >> reporter: kris van cleve, thanks. >> pelley: shortly after the attack, president trump called for unity. >> everyone on that field is a public servant -- our courageous police, our congressional aides who work so tirelessly behind the scenes with enormous devotion, and our dedicated members of congress, who represent our people. we may have our differences, but we do well in times like these to remember that everyone who serves in our nation's capital is here because, above all, they love our country. >> pelley: and just hours after the attack in alexandria, there was another mass shooting at a ups warehouse in san francisco. john blackstone is there. >> reporter: the street outside the ups distribution center filled with many of the building's 350 workers in the minutes after the shooting started. >> possible active shooter. >> reporter: drivers were gathering for a morning meeting when a ups employee with an assault pistol opened fire. marvin calderon had just finished loading his truck. >> i was scream, "g

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here's transportation correspondent kris van cleve. >> reporter: this dash cam a shows the red s.u.v.ilbert byrd was riding in slamming into a guardrail in tennessee. instead of collapsing backward, the guardrail splinters, sending metal through the vehicle, killing the 69 year old. he's one of at least seven deaths in three states authorities linked to x-lite guardrails. >> losing a child is j most horrific, horrific thing that anyone can imagine. >> reporter: ladeana gambill's daughter and her friend jacob davidson died after their vehicle hit an x-lite guardrail that pierced the car. >> to think she died senselessly, that's why we want the bring awareness to this issue, so that other folks don't lose their children. >> reporter: video from lindsay transportation systems which makes the x-lite shows how it's supposed to work, telescoping backward to help absorb an impact. instead the tennessee department of transportation found in some high-speed crashes, the first section of rail can separate, allowing the next section to potentially spear a vehicle. the state sent this letter to f