Mexican army troops stand watch as fellow soldiers work into the night digging through rubble on Calle Gante in Guadalajara, Mexico, April 25, 1992. A series of explosions in the sewer system ripped open streets, flattened buildings and hurled trucks and cars, killing at least 181 people and injuring hundreds. The new head of Guadalajara's sewer system said that a gas spill probably caused the explosion. (AP Photo/Damien Dovarganes)

Today in History: April 25

Inside the story: Photo gallery

Today is Monday, April 25, the 116th day of 2016. There are 250 days left in the year.

Republican presidential hopeful Sen. Ted Cruz  talks at the Old National Events Plaza in Evansville, Ind., Sunday, April 24, 2016.  (Denny Simmons/Evansville Courier & Press via AP)

Trump bristles at Cruz-Kasich collaboration

Inside the story: Poll

Donald Trump says an extraordinary collaboration between Ted Cruz and John Kasich aimed at unifying the anti-Trump vote in some remaining pr…