a four-year-old child climbed under a temporary bike rack along pennsylvania avenue triggering secret service to put the president residence under lock down for a few moments .
the incident is the second lockdown in washington only a day after a man shot and killed himself on saturday .
the man died after shooting himself on the west front of the capitol building just after 1 p.m. , capitol police spokeswoman kimberly schneider said .
no one else was hurt .