<span style="color: #222222;">Spain has stepped up security to confront a spate of explosive devices sent to high-profile targets, including the prime minister and the Ukrainian ambassador in Madrid.<br />''<br />''Spain has stepped up security to confront a spate of explosive devices sent to high-profile targets, including the prime minister and the Ukrainian ambassador in Madrid. Talking to reporters, Spain's Deputy Interior Minister Rafael Perez said, early indications suggest that all five of letter bombs were sent from within the country.<br />''<br />''He said, bomb disposal experts have defused these bombs. The minister said, the homemade devices were sent in brown packages containing a flammable powder and tripwire. In a statement, the Interior Ministry said, it has ordered police to strengthen security around public buildings and particularly check postal deliveries carefully.</span><br />