TODAY | April 26, 2014
>> members are being hailed as heroes after sivg a woman who was having a heart attack in the middle of the street. those intense moments caught on tape. kristen welker has more for us.
>> reporter: at the start of the busy tourist season in the nation's capital, security camera video captures the dramatic moments when secret service officers race to the aid of a woman on pennsylvania avenue near washington's most famous address.
>> i thought maybe she had just fainted but when i first arrived over there, i noticed she was foaming at the mouth, having trouble breathing. at that point, it only got worse.
>> reporter: uniformed secret service officers william grimmer and thomas hammond were on regular patrol when a tourist from dallas suffered a heart attack on her way to check in at a hotel with her husband.
>> reporter: using chest compressions, she started to breathe again, rushed to the hospital.
>> it's rewarding in itself to know that she's okay at this point.
>> reporter: a proud moment for an agency after officers were sent home from the negletherlands.
>> we had to attend to a medical call, a little more serious than we're used to, but it went down pretty flawlessly.
>> reporter: kristen welker, nbc news, washington.