Alerted by a detailed tip from Spanish colleagues, Dutch police arrested a 22-year-old man early Thursday and said he was suspected of preparing a “terrorist attack” on a concert by a Los Angeles rock band. The arrest in Brabant province, south of Rotterdam, came hours after police cancelled a performance Wednesday night by Los Angeles band Allah-Las at a converted grain silo in the heart of the port city. ... Police searched the man’s home after his arrest but released no details of anything they found. His identity was not released, in line with Dutch privacy guidelines. ... The 22-year-old...