Gulf authorities say the Saudi man who blew himself up in a Kuwaiti mosque last week arrived on a flight from the island nation of Bahrain and had no background suggesting he planned to carry out a terrorist attack.

The details released by Saudi and Bahraini authorities paint a fuller picture of the bomber in Friday’s attack that killed 27 Shiite worshippers. Kuwaiti officials have identified him as Fahad Suleiman Abdulmohsen al-Gabbaa.

Bahrain’s Interior Ministry said Monday that al-Gabbaa arrived on a Gulf Air flight from the Saudi capital, Riyadh, at 10:40 p.m. Thursday. He remained in transit for two and a half hours before boarding a connecting flight to Kuwait.

Saudi Arabia’s Interior Ministry said the bomber had no record with security forces or any background indicating terrorist activities.