SAN BERNARDINO, UNITED STATES: Twelve pipe bomb-like devices and thousands of rounds of ammunition were found at the home of the couple suspected of carrying out a mass shooting at a holiday party in California, police said on Thursday.

The four guns used in Wednesday’s attack in San Bernardino were legally purchased, city police chief Jarrod Burguan told reporters. The number of people wounded in the shooting has risen from 17 to 21, he said.