Delegation traveled to Mexican border city on May 6
Casi 50 personas viven en el Jardín de las Mariposas en Tijuana
Nearly 50 people living at Jardín de las Mariposas in Tijuana
Effort part of strategy to address migration 'root causes'
Jardín de las Mariposas is near the U.S. border
Jardín de las Mariposas has around 20 residents
Jardín de las Mariposas tiene casi 20 residentes
Incident took place in Tijuana at around 1:15 p.m. on Feb. 26
